There’s a really useful diagram on Wikipedia that shows the relatives sizes of different digital camera sensors. But it doesn’t include medium format film – so I made my own version.
| Format | Typical use | Size | Area | Crop factor |
|---|---|---|---|---|
| APS-C | Most consumer DSLRs and APS film cameras | ~22x15mm | 330mm² | 1.5-16× |
| 35mm | Professional full frame DSLRs and all 35mm film cameras | 36×24mm | 864mm² | 1.0× |
| 6×4.5 | Medium format cameras e.g. Mamiya M645 | 60×45mm | 2700mm² | 0.58× |
| 6×7 | Medium format cameras e.g. Mamiya RB67 & RZ67, Pentax 67 | 70×60mm | 4200mm² | 0.47× |
| 6×9 | Horseman 980, many box & folding cameras e.g. Kodak Brownie | 90×60mm | 5400mm² | 0.40× |
The crop factor is related to the field of view. To achieve the same angle of view as a 35mm camera, an APS-C sensor needs a shorter focal length while a 6×7 sensor needs a longer length. For more details, have a look at my article “focal length on different formats“.
The area is related to the resolution of the image. It’s not easy to tell exactly how many megapixels you get from film, but the resolution increases with area.
Jonathan Gazeley 
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