Pentax 645
For Pentax 645, flange focal distance (mm) is 70.87 mm; mount type is SLR; format is 6×4.5 cm; production years is 1984–, verified against its source on 2026-08-13.
- Mount name
- Pentax 645 verified
- Flange focal distance (mm)
- 70.87 mm verified
- Mount type
- SLR verified
- Format
- 6×4.5 cm verified
- Production years
- 1984– verified
- Throat diameter (mm)
- 61.2 per graphics.cornell.edu
What the source says
Pentax 645 | 70.87 mm | SLR | 6×4.5 cm | 1984–
— en.wikipedia.org, 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)
en.wikipedia.org says flange focal distance (mm) is 70.87 mm, as of 2026-08-13.
Pentax 645 | 70.87 mm | SLR | 6×4.5 cm | 1984–
https://en.wikipedia.org/wiki/Flange_focal_distance
graphics.cornell.edu says flange focal distance (mm) is 70.87, as of 2026-08-13.
Pentax 645 | bayonet | 70.87 | 61.2 |
https://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html
briansmith.com says flange focal distance (mm) is 70.87 mm, as of 2026-08-13.
Pentax 645 | 70.87 mm | SLR | 6X4.5 cm
https://briansmith.com/flange-focal-distance-guide/
allphotolenses.com says flange focal distance (mm) is 70.87, as of 2026-08-13.
Pentax 645 | 70.87 | Medium format camera
https://allphotolenses.com/articles/item/c_6.html
Mount type
en.wikipedia.org says mount type is SLR, as of 2026-08-13.
Pentax 645 | 70.87 mm | SLR | 6×4.5 cm | 1984–
https://en.wikipedia.org/wiki/Flange_focal_distance
graphics.cornell.edu says mount type is bayonet, as of 2026-08-13.
Pentax 645 | bayonet | 70.87 | 61.2 |
https://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html
briansmith.com says mount type is SLR, as of 2026-08-13.
Pentax 645 | 70.87 mm | SLR | 6X4.5 cm
https://briansmith.com/flange-focal-distance-guide/
allphotolenses.com says mount type is Medium format camera, as of 2026-08-13.
Pentax 645 | 70.87 | Medium format camera
https://allphotolenses.com/articles/item/c_6.html
Format
en.wikipedia.org says format is 6×4.5 cm, as of 2026-08-13.
Pentax 645 | 70.87 mm | SLR | 6×4.5 cm | 1984–
https://en.wikipedia.org/wiki/Flange_focal_distance
briansmith.com says format is 6X4.5 cm, as of 2026-08-13.
Pentax 645 | 70.87 mm | SLR | 6X4.5 cm
Sources
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Flange_focal_distance
- graphics.cornell.eduhttps://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html
- briansmith.comhttps://briansmith.com/flange-focal-distance-guide/
- allphotolenses.comhttps://allphotolenses.com/articles/item/c_6.html