M42
For M42, flange focal distance (mm) is disputed: 45.46 mm per briansmith.com, 45.5 per allphotolenses.com; mount type is disputed: SLR per briansmith.com, SLR 35mm camera per allphotolenses.com; format is 24X36 mm, verified against its source on 2026-08-13.
- Mount name
- M42 verified
- Flange focal distance (mm)
- 45.46 mm sources disagree
- Mount type
- SLR sources disagree
- Format
- 24X36 mm verified
What the source says
M42 | 45.46 mm | SLR | 24X36 mm
— briansmith.com, retrieved 2026-08-13
Sources disagree
More than one authority states this, and they do not state the same thing. Both are reproduced with the source each came from — deciding between them is yours, not ours.
Flange focal distance (mm)
briansmith.com says flange focal distance (mm) is 45.46 mm, as of 2026-08-13.
M42 | 45.46 mm | SLR | 24X36 mm
https://briansmith.com/flange-focal-distance-guide/
allphotolenses.com says flange focal distance (mm) is 45.5, as of 2026-08-13.
m42 | 45.5 | SLR 35mm camera
https://allphotolenses.com/articles/item/c_6.html
Mount type
briansmith.com says mount type is SLR, as of 2026-08-13.
M42 | 45.46 mm | SLR | 24X36 mm
https://briansmith.com/flange-focal-distance-guide/
allphotolenses.com says mount type is SLR 35mm camera, as of 2026-08-13.
m42 | 45.5 | SLR 35mm camera
Sources
- briansmith.comhttps://briansmith.com/flange-focal-distance-guide/
- allphotolenses.comhttps://allphotolenses.com/articles/item/c_6.html