Simply shine the laser light!
Measure welding bead (leg length) instantly and non-contact
● Easily measure with handheld type
● Simple measurement without contact
● Display and save leg length measurement results instantly
sdsvtadmin
Heat-resistant Borescope
In the observation section (high-temperature area), a bore is installed, and a camera is connected to the end of the bore for observation.
When observing images under high temperature using a heat-resistant borescope,
The following two methods are the main methods.
The following two methods are the main methods.
Without cooling device
Our borescope also has a heat-resistant type (compatible with 120℃).
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120℃ compatible borescope (φ4.0mm) Click here for product details
●Heat-resistant borescope that can handle up to 120℃ |
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120℃ compatible borescope (φ2.7mm) Click here for product details |
The compatible temperature is 120℃, but it is usually in stock and low price.
If it is a made-to-order product, we have borescopes that can handle up to 150℃.
Please refer to the website for details.
With cooling device
By attaching a cooling device to the borescope, it can withstand significantly high temperatures. It can even handle ultra-high temperatures exceeding 2000°C. This can be achieved by covering our borescopes with a heat-resistant jacket (custom-made) for borescopes with a diameter of φ4mm or larger (please refer to our website for details).
Insert water for cooling and air for tip purge into the heat-resistant jacket.
The ultra-heat-resistant borescopes are mostly made to order. After detailed discussions with the customer, production will commence. However, please note that the price for these custom-made products can reach several million yen.
For further details regarding the borescopes, please feel free to contact our technical staff at shodensha. We are more than happy to discuss your requirements and provide individual proposals tailored to your company’s needs.
Features of the φ1.8mm Borescope:
About φ1.8mm Borescope
Inspection of workpiece interiors and holes that couldn’t be directly observed before can now be conducted through non-destructive inspection using an ultra-thin borescope with a tip diameter of 1.8mm. With an effective length of 95mm, it offers excellent maneuverability, making it easy to inspect small parts and molds. Due to the proximity of the target object to the eyes during inspection, it helps reduce physical and eye strain.
When it comes to ultra-thin scopes, one might think of a narrow field of view, but our model features a wide 80° field of view despite its slim design. Additionally, the lenses provide extremely sharp images, allowing for comfortable observation without discomfort.
Of course, by using a camera adapter, you can connect it to a C-mount camera and view the images.
Inspection of workpiece interiors and holes that couldn’t be directly observed before can now be conducted through non-destructive inspection using an ultra-thin borescope with a tip diameter of 1.8mm. With an effective length of 95mm, it offers excellent maneuverability, making it easy to inspect small parts and molds. Due to the proximity of the target object to the eyes during inspection, it helps reduce physical and eye strain.
When it comes to ultra-thin scopes, one might think of a narrow field of view, but our model features a wide 80° field of view despite its slim design. Additionally, the lenses provide extremely sharp images, allowing for comfortable observation without discomfort.
Of course, by using a camera adapter, you can connect it to a C-mount camera and view the images.
You can view it in our showroom.
Due to its ultra-thin design, it is highly fragile, so we do not lend out demonstration units. We apologize to those who wanted to try it out, but we would be grateful if you could consider visiting our showrooms in Osaka or Tokyo.
What is a fiberscope? Features and differences from borescopes
When observing narrow spaces that cannot be directly visualized by the human eye, we use an ‘endoscope.’
Among them, the most well-known is the ‘fiberscope,’ but endoscopes come in various types, not limited to fiberscopes.
In this article, we will introduce the features of fiberscopes and other types of endoscopes to help you choose the right one for your needs.
1. Fiberscopes and Endoscopes
Many people might think that “Fiberscope = Endoscope.”
Fiberscopes are indeed one type of endoscope.
Back when camera miniaturization was not feasible, fiberscopes dominated the field of endoscopy. Consequently, they became synonymous with endoscopes.
Currently, fiberscopes are widely used for observations with diameters below φ1mm. Due to their relatively high cost, for diameters above φ1mm, people often opt for other types of endoscopes.
2. Characteristics of Fiberscopes
(1) Đường kính siêu mỏng cho phép quan sát các lỗ nhỏ hơn φ1 mm
The primary feature is, indeed, its thinness.
Since each fiber has a camera attached to its tip, there are various options for outer diameters.
The thinnest diameter possible is around φ0.35mm, and fiberscopes with diameters above φ1mm are also available for purchase.
(2) Structure of Fiberscopes
Fiberscopes consist of extremely thin fibers bundled together, with small lenses attached to the tip for internal observation.
However, due to the structure of bundling thin fibers, shadows of the honeycomb structure may be visible. (It’s possible to eliminate these shadows by capturing the observation image with a camera and applying image processing, but in doing so, the image may become slightly blurred.)
(3) Can be used in narrow, winding spaces
Since fibers are used, they can be inserted into the interior of winding pipes or into tight spaces within intricate machinery.
– Caution is required when handling!
The fibers are made of highly transparent materials such as quartz glass or plastic, so applying strong force to the fiber part or reducing the bending radius too much can cause the fibers to break.
(4) Not suitable for long lengths
By adjusting the length of the fibers, it’s possible to observe inside long pipes. However, since light (image) passes through the fibers, extending the length will proportionally darken the image. (This is due to losses from reflection within the fibers.) Additionally, because fibers themselves are expensive, the price increases proportionally with length.
◆ Capable of Observing Below φ1mm! Recommended Fiberscopes
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476,000円(税抜)
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By using an adapter lens, it’s possible to connect to a camera and observe on a PC or monitor.
3. Other Types of Endoscopes
(1) Endoscopes with Built-in Front Camera
Currently, there are many types of endoscopes available for sale, widely used in various fields. These endoscopes feature a small camera and lighting enclosed at the tip.
Our MIGS series corresponds to this type of endoscope.
＜Advantages＞
– Among endoscopes, relatively affordable due to the absence of special lenses or fibers. (*There are also high-end types with additional features.)
– The relay part consists of wires, allowing for greater flexibility than fibers. Additionally, long-length types are available.
– As it’s simply a camera, it can be adapted for various applications.
(*See below for details)
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Kenko brand: Ultra-Low-Cost Endoscope |
Endoscope with Handheld Tip Control |
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| Endoscope Connectable to Mobile Devices | Long-length endoscope | |
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| For SPI brand camera types, the minimum diameter is φ1.8mm. | Mitcorp Brand: Waterproof Type for Pipe Inspection, 22mm Length |
＜Disadvantages＞
– Resolution depends on the camera. (Resolution worsens as the camera size decreases.)
– Due to the size of the camera (sensor) and LED chips, it’s not possible to achieve the same thinness as fiberscopes or borescopes. (Minimum around φ1.8mm)
– Focus depends on the camera’s focal length, so it may not focus properly on close-up parts. (Minimum focusing distance: approximately 10mm to 15mm)
2) Borescopes (Rigid Endoscopes)
A borescope consists of multiple rod lenses enclosed in the tip of a stainless steel tube, designed to focus at the eyepiece (end).
Most borescopes have a basic shape similar to the following:
⇒ You can find Shodenshadensha’s borescope series here.
– It’s also possible to observe on a PC or monitor!
While the premise is for direct viewing, connecting a camera using an adapter lens allows for observation on a PC or monitor.
◆ Borescope, Adapter Lens, Camera Integrated as One!
Recommended Borescope Camera System
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398,000円(税抜)
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We also offer sets like “High Definition Camera + Camera Adapter + LED Light Source” as well as standalone options such as “Adapter Lenses” and “Borescope Dedicated Cameras”.
You can find Matsudensha’s borescope camera systems and options here: [link]
＜Advantages＞
– Image is sharper than with fiberscopes.
– It can observe objects at close proximity. (With a bit of adjustment, focusing can be achieved at around 3mm.)
– While not as thin as fiberscopes, it’s still capable of narrow diameters. (Our borescopes offer minimum diameters of around φ0.7mm.)
– Since there are no electronic devices such as cameras in the borescope part, it can be tailored for waterproofing, heat resistance, saltwater resistance, chemical resistance, etc. (Our products include standard heat-resistant types up to 120°C.)
＜Disadvantages＞
– Cannot be custom-made to any length due to the need to focus with multiple lenses.
– Cannot be bent due to the structure of glass lenses in stainless steel tubes.
– Glass lenses lack resilience against impacts or bending stress. (While not as resilient as larger diameters, they are durable with careful handling.)
– Generally, it’s more expensive than standard endoscopes with built-in cameras. (If used for direct viewing without connecting a camera, the price decreases.)
Summary
Many people might think that “Fiberscope = Endoscope,” but in fact, a fiberscope is just one type of endoscope.
There are various types of endoscopes, including:
– Fiberscopes
– Endoscopes with built-in front cameras
– Borescopes (rigid endoscopes)
Each has its own advantages and disadvantages, allowing you to choose the one that best suits your needs.
At Matsudensha, we offer a wide range of products, including the endoscopes mentioned here. For more details, please visit our product page below.
If you have any difficulty choosing an endoscope, please feel free to contact us via the inquiry button at the bottom of the page.
The characteristics of a borescope (rigid endoscope).
■ Regarding Field of View
The field of view is determined by the angle of view listed in the catalog. However, even with the same field of view, it becomes narrower as the diameter becomes smaller.
<Example>
When comparing φ0.7 and φ2.7, the field of view angle is almost the same.
(φ0.7 has 70°, and φ2.7 has 75°.)
| これをφ0.7とすると |  |
| φ2.7 would have this thickness. |  |
■ Regarding Resolution
For borescopes (rigid endoscopes), there are both rod lens type and fiber type. In our case, those with a diameter of φ2.7mm or larger are rod lens type, while those thinner are fiber type. Fiber type has lower resolution compared to rod lens type. When comparing fiber types with each other, resolution decreases as the diameter becomes smaller.
<Example> Observing an M4 screw hole.
φ2.7mm, rod lens type.
φ1.6mm, fiber type.
Due to the structure of bundling fibers, lines of the honeycomb structure of the fibers occur. In our case, we slightly reduce the contrast to eliminate those lines.
φ0.7mm, fiber type.
Even if you feel that the image is coarse with an endoscope type that has a camera built into the cable tip, using a borescope with a high-sensitivity, wide dynamic range video camera (as an example system) will improve clarity. Furthermore, depending on the camera’s functionality, you can reduce overexposure and shadows. (Resolution remains unchanged, but with a larger sensor size, brightness and clarity increase.)
We introduce borescope systems on shodensha’s product website. Please take a look. You can find it here
HIGH ADVANCED HIGH DEFINITION CAMERA DESIGNED FOR MICROSCOPY HDCT-20XM
Experience unparalleled visual clarity with our Full HD camera designed specifically for microscopy
Capable of capturing and storing observation images with remarkable precision
Optimized for inspections!
● Ideal for inspections with no display delay!
● Capable of saving images: The camera body features video and still image recording and playback functions.
Halation correction enabled!
● Wide dynamic range support allows for observation with images free from black crush and white blowout.
By utilizing the optional 1.8m wired remote control (¥4,000 excl. tax), you can save still images or videos, adjust images, and more without touching the back of the camera.
Affordable translucent illumination RD-95T
Transmitted illumination with surface emission Attaches to a compact stand with a diameter of φ95mm
● Surface emission transmitted illumination
● φ95mm
● Can be attached to our company’s small stand for microscopes with coarse and fine adjustment angles, as well as a fan-shaped base for microscopes. It can also be mounted on stands of similar size from other manufacturers
● Equipped with rubber feet on the bottom, allowing for standalone use
300mm Borescope （φ10mm） BAL-01033（300mm・0°）
●It allows non-destructive visual inspection of the inside of narrow parts that cannot be reached by the human eye.
●Effective length 300mm
●Compatible with various lighting such as M10 P=0.5 and M8 P=0.5
●Viewing direction 0° (direct view), 30° (side view)
300mm Borescope （φ10mm） BAL-31033（300mm・30°）
●It allows non-destructive visual inspection of the inside of narrow parts that cannot be reached by the human eye.
●Effective length 300mm
●Compatible with various lighting such as M10 P=0.5 and M8 P=0.5
●Viewing direction 0° (direct view), 30° (side view)
PORTABLE METALLURGICAL MICROSCOPE PMM-100
Suitable for various work sites and factories! Compact metallurgical microscope
Stored in a supplementary aluminum case for compact storage and portability
● Compact and lightweight! Allows observation of hard-to-move objects
● Convenient for carrying to on-site locations with a dedicated case
● Securely fixable to the object with a magnet XY stand
● Battery-operated adjustable LED coaxial illumination
● Polarization observation also possible with included polarizing filter
Selection of Industrial Lenses
Industrial cameras typically do not come with lenses included. Therefore, once you’ve chosen your camera, you’ll need to select a lens. However, choosing a lens requires some knowledge. Even when looking at the specifications of lenses, it’s often difficult to determine which one is best.
The most crucial parameter in selecting a lens is the area you want to capture with the camera and the distance to the subject. For example, if you want to capture a 30cm by 30cm area and the camera will be positioned 1 meter away, having such preferences can simplify the lens selection process.
If you have preferences like the example above, consulting our lens selection experts will allow us to recommend the best lens for your needs. However, if you prefer to choose a lens yourself, you can do so using the following methods.
①If you want to calculate and choose a lens yourself
If you want to calculate and choose a lens yourself:
For fixed-focus lenses, you can calculate the area based on the lens’s f-value. Consider your desired area in the aspect ratio of the camera sensor. If the camera sensor has a 4:3 aspect ratio, then the field of view will also be in a 4:3 ratio.
For example, if you want to capture a 30cm by 40cm area:
40cm (horizontal) × 30cm (vertical) field of view.
The formula for calculating the f-value is:
f-value = (Distance to the object (mm) × Camera sensor size (horizontal or vertical in mm)) / Desired area (horizontal or vertical in mm)
You can use either the horizontal or vertical values for calculation. If you choose to use the vertical sensor size in the calculation, adjust the area to match the vertical dimension as well.
Calculating in the vertical direction:
f-value = (1000 × 4.8) / 300
This results in an f-value of 16mm.
If the calculated result is not available in the lens lineup (e.g., f-value = 20), choose the closest available lens. For example, if the closest options are 16mm and 25mm, selecting the 16mm lens will provide a wider field of view than your desired area, while the 25mm lens will provide a narrower field of view.
For more detailed information, please refer to the following link.
② If you want to choose a lens yourself without performing calculations:
Actually, we have a convenient calculator on our company’s website that automatically calculates it for you by just entering the conditions. Simply select your camera and input the distance, and the optimal lens will be calculated for you. You can find the calculator at the following link
By leveraging ① and ②, you can select the lens you desire at any time.
Of course, you can always feel free to consult with our lens selection experts if you prefer.
About Protective Filters
Universal camera protective filters can be repurposed
When using a fixed-focus lens alone, close-up photography is not possible due to its minimum focusing distance.
We have confirmed the conditions necessary to secure a 10mm field of view. (The camera uses a 1/3-inch sensor)
■When using an f=25mm lens
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“Focal length approximately 70mm f=25mm lens + 5mm close-up ring”
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The field of view is approximately 10mm in the vertical direction
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■When using an f=16mm lens
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Focal length approximately 35mm f=16mm lens + 5mm close-up ring
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The ‘fixed-focus lens’ used in this observation is available from our company.
For more details, please visit the product page below
Precautions for Industrial Lens Replacement
When changing lenses, sometimes the C-mount ring may also come off when removing the lens
Please note that this state may not provide sufficient lens performance
The difference in appearance due to the aperture control of the macro zoom lens
We have a macro zoom lens with aperture control available at our company.
We’ll compare the differences in appearance due to the aperture
The shooting range is as shown in the above photo, but for a clearer comparison, we will enlarge and compare the red-framed area (including scratches, rough surfaces, and metallic surfaces)
1．Fully open aperture
The image becomes brighter and the resolution increases, but the contrast decreases
2．Stop down a bit
The image achieves a balanced mix of color reproduction, contrast, and resolution.
3．As narrow as possible.
The depth of field becomes deeper, but the resolution decreases
＜Reference＞
If you observe the same field of view with a medium magnification macro zoom lens, it will look like the following
The details of the ‘macro zoom lens with aperture control’ used this time can be found on the following product page.
Cách đạt được độ phóng đại 100 lần với tiêu cự 300mm
The silver part of our company’s long-distance lens (rear converter) is removed.
It’s a long-distance lens with a magnification ranging from 4x to 40x when the focal length is 300mm.
※ Magnification is calculated based on a 1/2.5 inch camera, equivalent to a 17-inch monitor.
A 5x rear converter is attached.
However, attaching a 5x rear converter will decrease both brightness and resolution.
Our long-distance lens is equipped with a focusing adjustment function, so you can use it with focal lengths ranging from 200mm to 400mm. When attaching the 5x rear converter, if the focal length is set to 200mm, the magnification will be approximately 150x.
METALLOGRAPHIC MICROSCOPE (ULTRA-HIGH MAGNIFICATION MICROSCOPE) GR3400J
High-quality metallographic microscope available at a reasonable price!
● Ideal for observing metals
● Adoption of wide-field eyepieces ensures high-quality and wide-field observation
● Capable of polarized observation with transmitted illumination
● Compatible with versatile microscope cameras
※ Voltage is compatible with 100V, but can be modified for international use upon request.
Method for attaching a filter to a lens without threaded screws for the filter
Here’s how to attach a filter to lenses that don’t have threaded screws at the front or are of the coaxial type, where filters cannot be directly attached.
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Convenient for this purpose are filters of the type shown on the left. (C-mount filters)
On the left is a color balance filter that reduces LED flicker and bluish tint. |
This type of filter is attached to the camera rather than the lens.
For our cameras…
| First, remove the C-mount ring | “Attach the filter.”
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Screw it in using the provided tool until it’s fully inserted |
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| This is the appearance after installation | ||
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| Reattach the C-mount ring and mount the lens | ||
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INVERTED-TYPE METALLOGRAPHIC MICROSCOPE (ULTRA-HIGH MAGNIFICATION MICROSCOPE) GR-29J-C3J
A full-fledged inverted-type metallographic microscope is available at a modest price!
● Optimal for the observation of metals
● Convenient for observing specimens with considerable thickness as it allows observation from below
● Utilization of wide-field eyepieces enables high-quality, wide-field observations
● Capability for polarized observations with incident illumination
● Compatible with versatile microscope cameras
※ The voltage is compatible with 100V; however, it can be adjusted for international compatibility upon request. Please inquire for further details.
※ A 100x objective lens (oil immersion lens) and immersion oil are not included with the demonstration unit. If you wish to use them, please inquire separately.
The method of attaching ring lighting to a slim lens
| 1. Attach a dedicated fixed ring to the tip | ||
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| 2.Utilize an easy arm for ring lighting | ||
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イージーアーム（リング照明用） KA-R
You can move the three joints freely |
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| It can be attached to a 3D arm (horizontal branch | ||
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When attached to a 3D arm, tilting the lens also tilts the LED ring light simultaneously, which is convenient | |
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“Of course, it can also be attached to a support pillar.” | |
The method of attaching the filter
The filters to be attached to the lens usually have ‘male and female threads of the same size’.
If it’s a 30.5mm filter, both would be labeled as M30.5mm. Therefore, you can stack multiple filters of the same size and use them together
Of course, it can also be attached to a 30.5mm lens. In the case of a universal lens, since the lens side has a female thread, you would attach the male threaded side of the filter.。
If you need to change the diameter, conversion rings like the following are available.
(The following is a ring for attaching a 37mm filter to a 28mm diameter lens.)
AFFORDABLE TRANSMISSIVE ILLUMINATION RD-95T
Surface-emitting transmissive illumination, compatible with a compact stand with a diameter of φ95mm.
● Surface-emitting transmissive illumination
● φ95mm
● It can be attached to our company’s small stands for microscopes with coarse and fine adjustment angles, as well as fan-shaped bases for microscopes. Additionally, it is compatible with stands of the same size from other companies
● Equipped with rubber feet on the bottom for standalone use
Lens and Filter Cleaning Method
I will describe the cleaning method for lenses and filters.
Lenses and filters can accumulate dust, debris, dirt, fingerprints, and other particles.
When cleaning, please follow the steps below.
**Items Needed:**
– Commercial lens blower
– Commercial lens cleaning tissues, paper, or lens cleaning cotton swabs
(Items with low or no dust generation)
– Commercial lens cleaning solution or high-purity ethanol
There are products available that combine the above items into one set.
Product by KING (Asanuma Corporation):
Camera Cleaning Kit
[Attention]
While a canned air duster can be used as a substitute for the blower, some canned air dusters may release fine water droplets. Please avoid using this type for lens and filter cleaning.
～Steps～
（1）Use the blower to blow away coarse debris from the surface of the lens or filter
[Attention]
If you wipe while dust is still adhered, it may scratch the lens surface or cause the coating to peel off. Please ensure thorough blowing to remove dust completely.
（2）Wrap lens cleaning paper around a lens cleaning stick or similar tool
[Attention]
While tweezers can be used as a substitute, if the paper tears and the metal directly touches the lens, it may scratch the lens surface or cause the coating to peel off. Please avoid using metal tweezers or those with sharp tips.
（3）Drip a few drops of cleaning solution onto the wrapped cleaning paper to moisten it.
(4) Wipe the surface of the lens
“There are two methods for wiping: radiating from the center to the periphery and spiraling from the center to the periphery. Choose according to the direction of dirt.
[Attention]
Please wipe gently. Wiping vigorously may cause the coating on the lens surface to peel off.”
（5）When there are water droplet residues, dry wipe.
[Attention]
Please wipe gently during this process. Wiping too hard may cause the coating on the lens surface to peel off.
BAR LED IllUMINATION LED-BL
● The adjustable beam angle allows for versatile applications
● Effective for evenly illuminating large objects
● Dimmable via the control box
● Equipped with a tripod hole (1/4 inch UNC) on the rear
● Compatible with Easy Arm, KA-N attachment
BAR LED IllUMINATION (DOUBLE, 10CM) LED-BL10-CH2
An effective 2-light bar illumination, double type, 10cm, ideal for evenly illuminating large objects
● Capable of brightening every corner of the object
● Dimmable for both LEDs with a single control box
● Independent lighting and dimming possible for each side
● Equipped with a tripod hole (1/4 inch UNC concave) on the back.
How to attach the lens to the small diameter ring light
| Introduce two types of ring lights
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| Space-saving LED lighting LED-16
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40 small diameter LED ring lights LED-40
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| Outer diameter φ48mm Inner diameter φ15mm
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Outer diameter φ63mm Inner diameter φ27mm
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| 16 lights flat (The LED angle is 0°, pointing straight down.)
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40 lights direct (The LED has an angle)
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| dimmable
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dimmable
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| ＜mounting method＞ | ＜mounting method＞ |
| Exclusive for M28/M42 （M42 is a standard called T-mount） |
The M28 female thread uses three fixed screws. |
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The slim lens is secured using M28. |
The slim lens is secured using M28. |
The standard lens (SDS-M) is secured using M42. |
The standard lens (SDS-M) is secured using three-point screws
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To reduce image distortion
Telecentric lens
Telecentric lenses allow you to obtain images with less distortion.
I experimented with our telecentric lenses RT3 and RT5.
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Telecentric lens RT3, RT5 Attach it to the USB camera. I took a photo of the glass scale. |
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| Photographed with telecentric lens RT3 | Photographed with telecentric lens RT5 |
| You can see that there is no distortion in the four corners of the screen. This is the feature of telecentric lenses. |
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CCTV lens
If you are using a CCTV lens, a telephoto lens will have less distortion than a wide-angle lens.
I experimented with a 6mm fixed focus lens and a 25mm fixed focus lens.
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I attached an 8mm fixed-focus lens to a USB camera and took a picture of graph paper. |
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It is evident that the four corners of the graph paper are distorted. |
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“I attached a 25mm fixed-focus lens to a USB camera and took a picture of graph paper.” |
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There isn’t much distortion observed at the four corners of the graph paper |
If it’s a macro lens, some lenses have less distortion depending on their performance, but they tend to be more expensive as a result.
Summary:
– By using a telecentric lens, you can obtain images with minimal distortion.
– The characteristic of a telecentric lens is that there is no distortion even at the four corners of the screen.
– If you are using a CCTV lens, using a telephoto lens rather than a wide-angle lens will result in less distortion.
– The characteristic of a telecentric lens is that there is no distortion even at the four corners of the screen.
– If you are using a CCTV lens, using a telephoto lens rather than a wide-angle lens will result in less distortion.
Types and characteristics of telecentric lenses
Main features of telecentric lenses
1. There is no expansion or contraction of the image within the depth of focus.
→It is possible to reduce measurement errors when measuring dimensions.
2. Less image distortion due to parallax
3. When used in conjunction with coaxial lighting, the brightness of the object is less uneven.
There are two main types of lenses: bilateral telecentric lenses and unilateral telecentric lenses.
We also handle both double-sided and single-sided telecentric lenses.
The characteristics of each are as follows.
Bilateral telecentric lens
A feature of this camera is that the projected size of the subject remains the same regardless of the distance between the camera sensor and the subject.
In other words, by changing the distance on the camera sensor side using a close-up ring, etc., you can change only the distance between the lens and the subject without changing the magnification.
However, the diameter of the lens is physically larger than the area to be projected, so the lower the magnification, the larger the lens size and the higher the price.
Used in precision measuring equipment and projectors.
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両側テレセントリックレンズ RT1 RT3 RT5 |
Unilateral telecentric lens
This lens has a telecentric lens structure only on the subject side.
Unlike a double-sided telecentric lens, when the distance to the camera sensor side changes, the size of the subject will change, just like a non-telecentric lens.
The lens is smaller and less expensive than a double-telecentric lens.
If changing the magnification like a macro zoom lens is not necessary for dimension measurement purposes, it may be used as a fixed magnification replacement.
(In addition to the subject-side telecentric lenses that we handle, there are also image-side telecentric lenses that have a telecentric lens structure only on the camera sensor side.
This is rarely used when photographing workpieces using a regular camera. )
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テレセントリックレンズ（同軸照明対応・W.D.65mmタイプ）
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メガピクセル対応テレセントリックレンズ（W.D.65mmタイプ）
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メガピクセル対応テレセントリックレンズ（同軸照明対応・W.D.65mmタイプ）
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Special telecentric lens
■Long distance telecentric lens
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A distance of 170 mm can be secured from the tip of the lens to the object.
At this level of magnification, there is not much difference in resolution compared to our zoom lens.
This is effective if you really want to make the lens and camera smaller.
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telecentric lens
（Working distance：170ｍｍ） |
TG lens + 0.5x auxiliary lens (focal length: 170mm) |
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■Space-saving, high-magnification telecentric lens
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The lens is small and the focal length is short at 40mm, making it convenient for installation in tight spaces.
Although the magnification is high, the resolution is lower compared to our zoom lens.
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Space-saving, high-magnification telecentric lens |
FZ lens + 2x auxiliary lens |
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| (⇓Enlarge the red frame above) | (⇓Enlarge the red frame above) |
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2Kigou pitch discrimination and number discrimination are not possible with a telecentric lens.
(Reference) When viewed with our highest resolution lens, it looks like the following.
Summary
The main features of telecentric lenses are
1. Since there is no expansion or contraction of the image within the depth of focus, measurement errors can be reduced when measuring dimensions.
2. Less image distortion due to parallax
3. When used in conjunction with coaxial lighting, the brightness of the object is less uneven.
And so on.
Double-sided telecentric lenses used in precision measurement equipment and projectors.
There are single-sided telecentric lenses, which have a telecentric lens structure only on the subject side.
Double-sided telecentric lenses are large and expensive, while single-sided telecentric lenses are small and relatively inexpensive.
Góc nhìn của ống kính là gì ?
Chỉ số thể hiện phạm vi của cảnh được chụp bằng camera, thường được diễn đạt dưới dạng góc độ. Được gọi là góc nhìn hoặc góc nhìn của ống kính.
Khi chụp một đối tượng, việc xác định góc nhìn của ống kính là rất quan trọng. Góc nhìn này phụ thuộc vào tiêu cự của ống kính và kích thước góc nhìn của camera.
Trong tài liệu mô tả ống kính, phạm vi của hình ảnh khi camera được cầm ở tư thế ngang được biểu thị bằng góc nhìn theo chiều ngang, dọc và đường chéo. Nếu chỉ có một con số được ghi, đó là góc nhìn theo đường chéo.
Các ống kính có góc nhìn rộng được gọi là ống kính góc rộng, trong khi các ống kính có góc nhìn hẹp được gọi là ống kính tele.
The difference between back focus and flange back?
Q: What is back focus
A: Back focus refers to the distance from the rear end of the lens to the focal plane (the imaging sensor of the camera).
If the back focus is misaligned, it will result in a focus shift.
Q: What is flange back?
A: Flange back refers to the distance from the lens mount’s mounting surface to the imaging sensor.
There can be confusion between flange back and back focus, but they are distinct concepts.
The distance from the camera’s C-mount to the imaging sensor surface (flange back) may vary slightly depending on the camera. Therefore, when changing lenses or cameras, it may be necessary to adjust the back focus.
(We ship products that combine cameras and lenses with precise adjustments.)
Additionally, for lenses with a back focus adjustment mechanism, customers can also make fine adjustments themselves.
We also offer lenses with a back focus adjustment mechanism as optional accessories.
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Back focus mechanism lens SDS-M19 |
For detailed product information, please contact our technical support.
Cameras and lenses can’t just be left anywhere; they need to be stored properly.
If you do not store it correctly, it may cause problems such as dust contamination and mold growth.
This time, we will introduce how to store your camera and lenses.
●Precautions when storing cameras and lenses
Things to be careful about when storing cameras and lenses are dust and moisture.
If dust gets into the lens or camera sensor, it cannot be cleaned easily and can cause glare when taking pictures.
In addition, moisture can cause the lenses to become cloudy and cause mold to grow.
If dust gets inside the camera or lens, and if it becomes moldy, the only option is to disassemble it and clean it, so it is important to prevent mold from forming.
Additionally, camera and lens cleaning (removal of dust and mold) is not covered by the manufacturer’s warranty. If you request repairs, the repair costs will be considerable.
(Items are covered by our manufacturer’s warranty immediately after purchase.)
Therefore, it is necessary to store it carefully to avoid dust and moisture.
●What is the best storage method?
Inside cupboards, drawers, and on desks, there is a high risk of dust and mold.
Even if it’s in your camera bag, there are risks.
Generally, the optimum humidity for storing cameras and lenses is said to be around 40-50%.
Humidity exceeding 60% can cause mold to grow, and even in environments with extremely low humidity.
I can’t say it’s good. Therefore, it is necessary to maintain proper humidity.
Also, extreme temperature differences can lead to condensation, so you need to be careful about temperature differences as well.
①Prepare a case to store your camera and lenses
First, prepare a case (container) to store your camera and lenses.
Placing it in a case will prevent dust from entering, and sealing it will also prevent moisture from entering.
Cases include the following。
～Dry box (moisture proof)～
A specialized moisture-proof storage for storing cameras and optical products. They range from small types to large cabinet-type types.
You can store it with peace of mind as it always maintains stable humidity.
It seals and protects it from moisture and dust.
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Homepage of Toyo Living Co., Ltd., a manufacturer of moisture-proof storage cabinets https://www.toyoliving.co.jp/products-info/ED-80CATP2B-1.html |
～Simple dry box or sealed container～
Simple dry boxes are popular and easy to use.
A sealed moisture-proof case sold by camera accessory manufacturers.
You can also check the humidity by putting a desiccant inside and a simple hygrometer.
Even beginners can easily store their cameras and lenses.
You can also use airtight food containers with rubber gaskets on the lids, which are now available at 100 yen shops and home centers.
Although it can easily protect against moisture and dust at low cost, it requires frequent humidity checks and replacement of the desiccant.
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②Prepare desiccant
A simple dry box or airtight food container is a container, and it is necessary to add a desiccant to reduce humidity.
Commercially available desiccant for dry boxes or food-grade silica gel can also be used instead.
Be sure to include a desiccant agent and a hygrometer to check the humidity.
③Clean thoroughly before storing
Cameras and lenses that have been used have dust attached to them.
Clean thoroughly before storing.
There is no point in storing your camera or lens in an enclosed space if you introduce dirt into it.
④Cleaning and cleaning of the camera and lens
Blow away dust and dust from the camera and lens using a blower sold by camera accessory manufacturers.
Also, wipe off any dirt or oil on the surface with a cleaning cloth.
Wipe off sweat and oil from your hands, as this is a source of nutrients for mold.
Should the lens be removed from the camera?
It is up to you whether or not to remove the lens when storing it, but there is no problem if you store it with the lens attached.
However, the more frequently you replace or remove lenses, the greater the risk of dust getting into them.
Also, when removing the lens, put a cap on the camera lens mount and store it.
●Temporary storage of cameras and lenses
Care must also be taken when storing the camera temporarily, such as while changing lenses.
Even if you can’t see it, dirt, dust, dirt, etc. are floating in the air.
You can tell because dust accumulates on shelves at home.
Replacing lenses is a time when there is a high risk of dust and dirt getting inside.
Therefore, you need to pay attention to how you place your camera and lens.
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The camera sensor is exposed and facing the top, and dust falls onto the sensor inside the camera. |
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The lens C mount is exposed and faces toward the top, and dust falls onto the lens. |
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The object side of the lens is exposed and faces toward the top, and dust falls onto the lens. |
Cameras and lenses may come with a cap (lid) at the time of purchase.
By attaching the cap as soon as possible, you can reduce the risk of dust getting in.
Also, be careful when placing the lens on the desk when replacing it.
Instead of placing the sensor or lens facing towards the top, place it horizontally to prevent dust from falling.
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The camera sensor is placed horizontally, but there is still a medium risk. It is advisable to put on the cap immediately. |
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The lens surface is placed horizontally, but the risk is still medium. It is advisable to put on the cap immediately. |
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Caps on both ends of the lens Attach the caps to the camera |
●Summary of how to store cameras and lenses
・Be careful of dust and moisture on your camera and lens.
・If dust or mold grows on the camera or lens, it is difficult to remove it.
Therefore, store it in an environment that does not generate dust or mold.
– Store in a special case to prevent dust and mold from growing.
・Carefully take care of your camera and lens to remove dust, dirt, and oil before storing them.
Please do not bring it in.
・No problem if you leave the lens on
– Be careful when storing temporarily or changing lenses.
4K Zoom Lens (Intermediate Mgnification) SDS-KFZ
● High-resolution zoom lens compatible with 4K cameras
● Zoom ratio of 10! (Optical magnification x0.5-x5.0)
Covering a wide range of magnifications
● Compatible with C-mount cameras up to 2/3 inch sensor size
● Lens diameter: φ50mm
● We also offer high-resolution 4K microscopes equipped with this lens.
Accessory to extend the focal length of a microscope
There is an option called the ‘0.5x auxiliary lens’ that approximately doubles the operating distance. (Please note that some models may not have the option of auxiliary lenses available.)
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0.5x Auxiliary Lens for Standard Lens: TG-0.5
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<Changes in Operating Distance>
* With the optional 0.5x auxiliary lens (TG-0.5) for the standard lens:
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Without TG-0.5
(installed on TG500CS) |
With TG-0.5
(installed on TG500CS) |
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Working distance
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90mm
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160mm
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When using the 0.5x auxiliary lens, the operating distance becomes longer, and the distance between the lighting and the object also increases. Therefore, it is necessary to use the lighting LED angle (bottom: LED-A2) to fix the lighting near the object.
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| LED angle（LED-A2） | Mounting Example |
If you have any questions, please feel free to contact technical support.”
What is chromatic aberration?
Chromatic aberration refers to the displacement (color shift) of an image created by a lens due to the wavelength of light. Even when using the same lens, the refractive index of the lens varies depending on the wavelength of light, causing differences in focal length based on color. As a result, when looking through the lens, the position where the image is focused shifts, causing blurring.
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In a state where chromatic aberration is occurring: Blue, red, and green light are not focused together, but are dispersed separately. |
To mitigate chromatic aberration, there are compound lenses such as achromatic lenses, which are made by bonding several types of lenses together. While using these lenses can minimize chromatic aberration as much as possible, it cannot be completely eliminated.
Bộ phụ trợ ống kính (ống kính chuyển đổi phía trước
Bằng cách lắp đặt vào phía trước của ống kính chính (phía đối tượng), bạn có thể điều chỉnh độ phóng đại. Đồng thời, bạn cũng có thể điều chỉnh khoảng cách làm việc (W.D.).
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＜Thay đổi độ phóng đại và khoảng cách tiêu điểm khi sử dụng bộ phụ trợ 0.5 lần＞
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Độ phóng đại
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Khoảng cách làm việc
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x25～x140
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90mm
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TG500CS + ống kính phụ 0.5 lần
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x13～x70
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150mm～160mm
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＜Sự khác biệt trong cách nhìn khi gắn bộ phụ trợ 0.5 lần vào TG500CS＞
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TG500CS (không có ống kính phụ 0.5 lần) Khi ở độ phóng đại thấp nhất
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TG500CS (đã gắn ống kính phụ 0.5 lần)
Khi ở độ phóng đại thấp nhất |
Bạn có thể nhận thấy rằng phạm vi tầm nhìn đã mở rộng khi gắn ống kính phụ 0.5 lần.
※ Khi sử dụng ống kính phụ 0.5 lần, khoảng cách làm việc sẽ thay đổi, làm tăng khoảng cách từ nguồn sáng đến đối tượng, vì vậy bạn cần phải điều chỉnh vị trí ánh sáng bằng cách sử dụng góc LED.
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Đèn LED góc LED-A2
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Đính đèn vòng LED lên đèn góc LED.
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Useful goods when you want to increase your W.D
If you don’t mind sacrificing magnification, use a 0.5x auxiliary lens to increase W.D.
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標準レンズ専用0.5倍補助レンズ TG-0.5
<Example> |
However, in this case, the position of the LED ring light attached to the tip of the lens will be moved away from the object and the light will become dark, so it is necessary to improve the lighting by changing to a higher brightness light or removing the diffuser plate. will become necessary.
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高輝度80灯LEDリング照明 GR-80N2 |
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With removable diffuser plate |
It is possible to change the position of the lighting using the LED angle, but this will interfere with the extended W.D., so use twin arm lighting (SPF-D2), LED spot lighting (SPF-FL3), etc. We recommend.
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Even though I used a 0.5x auxiliary lens to extend the W.D. If you lower the position of the lighting using an LED angle This will interfere with the W.D. that you have worked so hard to develop. |
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Therefore, we recommend using twin arm lighting (SPF-D2), LED spot lighting (SPF-FL3), etc.
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ツインアームLED照明 SPF-D2
Stationary type dimmable LED twin arm lighting. |
Please contact technical support for details.
Lens numerical aperture and resolution
1.What is lens resolution?
When observing an object with magnification, magnification is of course important, but
It is also important to be able to discern fine details.
This ability is called resolution,
It is expressed as “the minimum distance that allows two points that are close to each other to be distinguished.
Resolution = Distance at which two points can be identified
*If you are observing the presence or absence of minute objects, it is possible to check even smaller objects.
Expressed mathematically, resolution = kλ/NA.
k is a coefficient and values of 0.61 and 0.5 are used.
λ is the wavelength of light. For normal visible light, use 0.55μm.
NA is the numerical aperture of the lens. (This value indicates one of the lens’s performance.)
The larger the numerical aperture, the higher the resolution (smaller the numerical value).
(Example) If the lens has a numerical aperture (NA) of 0.9,
Resolution = 0.5×0.55/0.9 = 0.30μm.
If the distance between two points is 0.30μm, two points can be identified.
There is no relationship between resolution and magnification, so no matter how much you increase the magnification with this lens,
The discrimination between two points is 0.30μm.
2. Numerical aperture of lens
This is an important value that determines the performance of the lens.
Numerical aperture (NA) = nsinθ
n is the refractive index of the medium from the object to the lens, and if it is air, n = 1.
θ is the amount of light that enters the lens from the point where the optical axis intersects the object.
This is the outermost angle.
The larger the numerical aperture
This will be a bright lens.
Also, since resolution = kλ/NA, the larger the numerical aperture, the
The resolution will be higher. (The number will be smaller.)
3. Examples of our megapixel compatible telecentric lenses
The numerical aperture is 0.026.
Resolution = (0.61×0.55)/0.026 = 12.9μm.
This almost matches the resolution (12.7μm) in the table above.
4. Examples of our medium magnification zoom lenses
The numerical aperture of our medium magnification zoom lens (SDS-M) ranges from 0.014 (at the lowest magnification) to 0.036 (at the maximum magnification).
Resolution at lowest magnification = (0.61×0.55)/0.014 = 23.9μm
Resolution at maximum magnification = (0.61×0.55)/0.036 = 9.3μm.
What is an auxiliary lens (rear converter lens)?
By installing it between the camera and the main lens, you can change the magnification without changing the W.D. (working distance).
However, the disadvantages are that the brightness decreases (the F value increases), the resolution and contrast decrease, and the focus becomes poor.
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Attach it between the camera and the main lens.
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What is a macro lens/macro zoom lens?
A lens designed for close-up photography is called a macro lens.
A macro zoom lens is one in which the magnification can be changed continuously and the focal length is constant (does not change).
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Strictly speaking, lenses that can change the magnification continuously but whose focal length changes are not called zoom lenses.
Sometimes called variable magnification lenses to distinguish them from zoom lenses.
Sometimes called variable magnification lenses to distinguish them from zoom lenses.
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If you want to keep the price down without changing the magnification frequently, we recommend a variable magnification lens, and if you change the magnification frequently, we recommend a macro zoom lens.
Relationship between depth of field and working distance
The following two methods are typical for deepening the depth of field.
(1) Increase the depth of field distance.
(2) Narrow down the optical path *For information on aperture, please refer to “What is depth of focus/depth of field?”
This time I will explain (1).
■ Relationship between depth of field and working distance
Below is a spec table for lenses of the same manufacturer, same series, and same magnification (X4).
The longer the W.D., the deeper the depth of field.
■Actual measurement of depth of field due to differences in working distance
Comparative imaging using lenses from the same manufacturer and series but with differing working distances, observing a glass scale with a 0.2mm pitch tilted at a 45-degree angle and viewed from directly above.
(1) Observation using a lens with an optical magnification of 6x and a working distance of 40mm.
If you determine that the focus is aligned with one increment (0.2mm), then the depth of field can be calculated as 0.2mm x (1/√2) = 0.14mm.
(2) Verification using a lens with an optical magnification of 6x and a working distance of 110mm.
If you determine that the focus is aligned with two increments (0.4mm), then the depth of field can be calculated as 0.4mm x (1/√2) = 0.28mm.
