Back Focal Distance Of C-mount Lens
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Related Faq
Q
Q: Can the filter avoid the black cross phenomenon?
A
Answer: By design we can avoid the use of the filter in non-wide angle lens will not have dark corners, if your focal length is less than 24mm still may back to produce. 
Q
Does it have thread at front side for another filter to fit. If yes is the back side and from side thread are of same size or different. Thank you
A
It has,for this series, front thread diameter is bigger than the back thread diameter. For example: Back thread diameter (attach to lens): 55mm Front thread diameter (attach additional filter/other accessories): 58mm 
Q
image stabilization has been removed after update, why?
A
It's not worth it, I sent mine back 
Q
will it work with samsung s10?
A
It should work with any phone. The phone adapter fits on the back lens and it can position the phone it any way and lock it in 
Q
The filter can avoid the black cross phenomenon?
A
By design we can avoid the use of the filter in non-wide angle lens will not have dark corners, if your focal length is less than 24mm may still return to produce. 
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