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Forum: Pentax DSLR Discussion 03-13-2017, 10:29 PM  
understanding the 1.5 crop factor
Posted By filoxophy
Replies: 37
Views: 4,674
For what it's worth (not much), the K and M42 mounts have a 45.46mm registration distance.

The reason for the 43mm lens focal length is its near-equivalence to the film/sensor diagonal (a proxy for "normal" focal length across formats).

But yes I agree that certain focal lengths are easier to design for specific registration distances.
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