70×56 mm
Dimensions
0.48×
Crop factor
3920 mm²
Area (454% of FF)
+2.2
Stops of light vs full frame
5:4
Aspect ratio
62.2 µm
Circle of confusion
About 6 × 7 cm film#
'Ideal format' for enlargement — 10 frames per 120 roll.
Typical cameras: Mamiya RB67, RZ67, Pentax 67, Mamiya 7.
Compared to other formats#
Lens needed for the same framing#
| Full-frame focal length | Equivalent on 6 × 7 cm film | Horizontal angle |
|---|---|---|
| 14 mm | 29.0 mm | 100.7° |
| 24 mm | 49.7 mm | 70.3° |
| 35 mm | 72.5 mm | 51.5° |
| 50 mm | 103.6 mm | 37.3° |
| 85 mm | 176.1 mm | 22.5° |
| 135 mm | 279.7 mm | 14.3° |
| 200 mm | 414.4 mm | 9.7° |
Equivalent aperture for depth of field#
| On 6 × 7 cm film | Full-frame equivalent |
|---|---|
| f/1.4 | f/0.7 |
| f/2 | f/1.0 |
| f/2.8 | f/1.4 |
| f/4 | f/1.9 |
| f/5.6 | f/2.7 |
| f/8 | f/3.9 |
Frequently asked questions#
What is the crop factor of 6 × 7 cm film?
0.48× (diagonal 89.6 mm vs 43.3 mm for full frame).
How big is a 6 × 7 cm film sensor?
70 × 56 mm, an area of 3920 mm².
Is 6 × 7 cm film good in low light?
At the same exposure it gathers 2.2 stops more total light than full frame, so expect roughly that much less visible noise at equal print size. Modern processing narrows but doesn't erase the gap.
Last updated October 03, 2026 · How we calculate · Sources