When using a USB camera, there is also a software option to apply digital zoom, but this may come at the expense of resolution.
For example, if you use a 2 million pixel camera at full resolution, the resolution will be 1600×1200.
The resolution is 800 x 600 = 480,000 pixels. If the magnification is 2x, the resolution will be 1/4, and if it is 3x, it will be 1/9.
Even in the case of 5 million pixels, it will be 1.25 million pixels with 2x digital zoom and 550,000 pixels with 3x.
Optical zoom, on the other hand, allows you to increase the magnification without sacrificing resolution (although it actually drops slightly).
Even if the lens does not have the ability to increase the focal length, you can easily increase the magnification by using a component called a rear converter. In addition, when using a rear converter, there is no need to change the installation position of the camera, since the focal length and other factors do not change.
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