The closest distance to the object within the in-focus range (observation distance) is called the closest distance.

 

The closest distance has characteristics depending on the type of endoscope.

 

1. Endoscope equipped with advanced camera

Since there is a camera at the tip, the optical closest distance is longer.

 

In the case of our endoscope, the closest distance is 10 mm.
The recommended viewing distance is 10-60mm.

　　　　

 

 

Although it is made by another company, some low-priced models seem to have a closest distance of about 40mm.

 

 

 

 

2. Borescope

 

Borescopes and fiberscopes have relatively short closest distances.

This is not a guaranteed value as there are individual variations, but when connecting a camera with our borescope, the closest distance is approximately 5 mm.

 

		Lens focus tonality can be adjusted, but there are limits. The limit is around 5mm.
		When we checked with our current product, the closest distance was 4.5mm.

 

 

 

 

◆How to shorten the closest distance

 

By inserting a close-up ring (5mm), the closest distance can be reduced to about 3mm.

 

 

 

		When using our current product with a close-up ring (5mm), the closest distance was 2.5mm.

 

 

 

 

The “borescope camera” used this time is available at our company.

Additionally, our Borescope Camera Adapter Lens is equipped with a 5mm close-up ring as standard.

For details, please see the product page below.