[Specification 2] Mounting screw: 36 threads/inch φ20.32 (JIS B 7141)
[Material/Finish] -
[Set contents/accessories] -
【Note】 ● NA (Numerical Aperture): An index that determines numerical aperture and lens performance (resolution, brightness, depth of focus). The higher the NA, the higher the resolution, the brighter the image, and the narrower the depth of focus. ●Resolution values are calculated values. ●Field number: The range (diameter) of the objective lens image that can be observed through the eyepiece.