Specifications#
- Brand
- Mamiya
- Model
- 645
- Camera type
- Film SLR
- Released
- 1975
- Lens mount
- Mamiya 645
- Film format
- 6 × 4.5 cm (645) film
- Image area
- 56.0 × 41.5 mm (6 × 4.5 cm (645) film)
- Crop factor
- 0.62×
- Viewfinder
- Interchangeable
- Metering
- Through interchangeable prisms
- Exposure modes
- Manual or Aperture Priority
- Lens
- Interchangeable lens
- Made in
- Japan
Specifications merged from Wikipedia and Lensfun. Spot an error? Tell us.
Sensor size compared#
Focal length equivalents & field of view#
Multiply any focal length by 0.62 to get the full-frame field of view. Angles are for a rectilinear lens focused at infinity.
| Lens on this camera | Full-frame equivalent | Horizontal | Vertical | Diagonal |
|---|---|---|---|---|
| 21 mm | 13 mm | 106.3° | 89.3° | 117.9° |
| 23 mm | 14 mm | 101.2° | 84.1° | 113.2° |
| 28 mm | 17 mm | 90.0° | 73.1° | 102.4° |
| 32 mm | 20 mm | 82.4° | 65.9° | 94.9° |
| 35 mm | 22 mm | 77.3° | 61.3° | 89.8° |
| 45 mm | 28 mm | 63.8° | 49.5° | 75.5° |
| 55 mm | 34 mm | 54.0° | 41.3° | 64.7° |
| 63 mm | 39 mm | 47.9° | 36.5° | 57.9° |
| 80 mm | 50 mm | 38.6° | 29.1° | 47.1° |
| 90 mm | 56 mm | 34.6° | 26.0° | 42.3° |
| 110 mm | 68 mm | 28.6° | 21.4° | 35.2° |
| 120 mm | 74 mm | 26.3° | 19.6° | 32.4° |
| 150 mm | 93 mm | 21.1° | 15.8° | 26.2° |
| 180 mm | 112 mm | 17.7° | 13.2° | 21.9° |
| 250 mm | 155 mm | 12.8° | 9.5° | 15.9° |
| 350 mm | 217 mm | 9.1° | 6.8° | 11.4° |
Depth of field table#
Total depth of field at each subject distance, using a circle of confusion of 48.3 µm (the 0.030 mm full-frame standard scaled by the crop factor).
| Focal | Aperture | 50.0 cm | 1.00 m | 2.00 m | 3.00 m | 5.00 m | 10.0 m | Hyperfocal |
|---|---|---|---|---|---|---|---|---|
| 35 mm | f/1.8 | 3.3 cm | 13.8 cm | 56.9 cm | 1.32 m | 4.03 m | 28.4 m | 14.1 m |
| 35 mm | f/2.8 | 5.2 cm | 21.6 cm | 91.1 cm | 2.20 m | 7.84 m | ∞ | 9.09 m |
| 35 mm | f/4 | 7.4 cm | 31.2 cm | 1.37 m | 3.59 m | 20.3 m | ∞ | 6.37 m |
| 35 mm | f/8 | 15.0 cm | 67.1 cm | 4.03 m | 45.2 m | ∞ | ∞ | 3.20 m |
| 70 mm | f/1.8 | 0.8 cm | 3.3 cm | 13.7 cm | 31.3 cm | 88.2 cm | 3.64 m | 56.4 m |
| 70 mm | f/2.8 | 1.2 cm | 5.1 cm | 21.4 cm | 48.9 cm | 1.39 m | 5.93 m | 36.3 m |
| 70 mm | f/4 | 1.7 cm | 7.3 cm | 30.6 cm | 70.3 cm | 2.02 m | 9.26 m | 25.4 m |
| 70 mm | f/8 | 3.4 cm | 14.8 cm | 62.4 cm | 1.47 m | 4.58 m | 40.6 m | 12.7 m |
| 119 mm | f/1.8 | 0.2 cm | 1.1 cm | 4.6 cm | 10.6 cm | 30.0 cm | 1.22 m | 163 m |
| 119 mm | f/2.8 | 0.4 cm | 1.7 cm | 7.2 cm | 16.5 cm | 46.7 cm | 1.91 m | 105 m |
| 119 mm | f/4 | 0.5 cm | 2.4 cm | 10.3 cm | 23.6 cm | 66.9 cm | 2.75 m | 73.4 m |
| 119 mm | f/8 | 1.0 cm | 4.8 cm | 20.6 cm | 47.5 cm | 1.36 m | 5.82 m | 36.7 m |
| 196 mm | f/1.8 | 0.1 cm | 0.4 cm | 1.6 cm | 3.8 cm | 10.9 cm | 44.4 cm | 442 m |
| 196 mm | f/2.8 | 0.1 cm | 0.6 cm | 2.5 cm | 5.9 cm | 16.9 cm | 69.2 cm | 284 m |
| 196 mm | f/4 | 0.2 cm | 0.8 cm | 3.6 cm | 8.5 cm | 24.2 cm | 98.9 cm | 199 m |
| 196 mm | f/8 | 0.3 cm | 1.6 cm | 7.3 cm | 16.9 cm | 48.5 cm | 1.99 m | 99.6 m |
Equivalent aperture#
Exposure is identical at the same f-number on any format; equivalence only describes depth of field and total light.
Night-sky exposure limits#
Longest exposure before stars trail. The NPF rule accounts for pixel pitch and is stricter than the classic 500 rule — use it for pin-sharp stars on high-resolution sensors. (NPF needs a known resolution and is omitted here.)
| Focal length | 500 rule |
|---|---|
| 23 mm (14 mm eq.) | 35.0 s |
| 32 mm (20 mm eq.) | 25.2 s |
| 39 mm (24 mm eq.) | 20.7 s |
| 56 mm (35 mm eq.) | 14.4 s |
| 81 mm (50 mm eq.) | 9.9 s |
Handheld shutter speed guide#
The reciprocal rule uses the equivalent focal length. High-resolution sensors may need one stop faster than this for pixel-sharp results.
| Focal length | No stabilisation (1/equiv. focal) | With 3-stop IS | With 5-stop IBIS |
|---|---|---|---|
| 39 mm | 1/25 s | 0.3 s | 1.3 s |
| 81 mm | 1/50 s | 1/6 s | 0.6 s |
| 161 mm | 1/100 s | 1/13 s | 0.3 s |
| 322 mm | 1/200 s | 1/25 s | 1/6 s |
Film stocks for the Mamiya 645#
Films currently made in 120 format.
- ADOX CHS 100 II ISO 100
- ADOX CMS 20 II PRO ISO 20
- ADOX HR-50 ISO 50
- Agfa Copex Rapid ISO 50
- Bergger Pancro 400 ISO 400
- CatLABS X FILM 100 Color ISO 100
- CatLABS X FILM 320 Pro ISO 320
- CatLABS X FILM 80 ISO 80
- CineStill 400D ISO 400
- CineStill 50D ISO 50
- CineStill 800T ISO 800
- CineStill Red Rum ISO 200
- CineStill bwXX ISO 250
- FILM Ferrania Orto ISO 50
- FILM Ferrania P30 ISO 80
- Film Photography Project Dracula ISO 64
- Film Photography Project Frankenstein ISO 200
- Film Photography Project THE MUMMY 400 ISO 400
Similar cameras#
Other 6 × 4.5 cm (645) film film cameras from around the same time.
Frequently asked questions#
What is the crop factor of the Mamiya 645?
The Mamiya 645 has a crop factor of 0.62× relative to 35 mm full frame (diagonal 69.7 mm vs 43.3 mm).
What size is the Mamiya 645 frame?
56.0 × 41.5 mm (6 × 4.5 cm (645) film), an area of 2324 mm² — 269% of full frame.
What lens mount does the Mamiya 645 use?
The Mamiya 645 uses the Mamiya 645 (flange distance 63.30 mm).
How long can I expose the night sky with the Mamiya 645?
With a 32 mm lens (20 mm equivalent) the 500 rule gives 25 s.
Sources & licences#
- Wikipedia: Mamiya 645 — CC BY-SA 4.0
- Wikidata Q16887281 — CC0
- Lensfun camera database — CC BY-SA 3.0
Last updated October 03, 2026 · How we calculate · Sources