M42: Pentax, Praktica, Contax S, …

For M42: Pentax, Praktica, Contax S, …, flange focal distance (mm) is 45.46; mount type is M42×1 thread; throat diameter (mm) is 42, verified against its source on 2026-08-13.

Mount name: M42: Pentax, Praktica, Contax S, … verified
Flange focal distance (mm): 45.46 verified
Mount type: M42×1 thread verified
Throat diameter (mm): 42 verified

Sourcegraphics.cornell.edu

Verified2026-08-13

Review by2028-08-12

DatasetCamera mount flange focal distance and adapter feasibility

What the source says

M42: Pentax, Praktica, Contax S, … | M42×1 thread | 45.46 | 42 |

— graphics.cornell.edu, retrieved 2026-08-13

Source

graphics.cornell.eduhttps://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html

Last verified against source: 2026-08-13. Due for re-check by 2028-08-12. This page as Markdown · OKF bundle · full dataset as JSON.