Square photos were cool well before Instagram and remains a very popular format for 120 roll film. It measures 79.2mm diagonally.Īs you can easily deduce, the 6 x 6 format is a square format, or a 1:1 ratio. Popular 645 format lenses and their 35mm equivalents include the following. Popular 645 format cameras include the Mamiya M645, 645E, 645 Pro and the 645 AF series the Pentax 645 and 645N the Bronica RF645 and ETR models the Contax 645 the Hasselblad H1 and H2 and the Fujifilm GA645, GS645 and GX645 models. The 645 format is the generally the smallest frame size you will see used on 120 roll film. The goal, however, is to provide a reasonably accurate and consistent measurement in order to identify “equivalent focal lengths” to your full frame lenses that you know by heart. These crop factors are based on a diagonal measurement of the negative, so some of the odd ratios may be a little off if you are comparing them purely to the native 2:3 aspect ratio of 35mm film. ![]() Crop Factors on Medium Format Camerasįor those coming from a digital world to test the film waters with medium format cameras, the 35mm crop factor for medium format lenses and film types can be confusing when a 50mm lens can be ultra-wide and a 90mm lens is considered a normal lens.īelow, you will find a crop factor for all of the popular medium format film ratios using 120/220 roll film. It is simply that the 50mm lens has a narrower field of view on the Canon Rebel DSLR thanks to the smaller sensor. Of course, most of us understand that this is a misnomer and that the 50mm lens does not change at all to become an 80mm lens when used on a different camera. For instance, the popular Canon EF 50mm f/1.8 lenses have an 80mm equivalent focal length when used with a Canon Rebel series camera. We also commonly use the phrase “equivalent focal length” to describe the change in the field of view as captured by an APS-C sensor. ![]() However, the term is ubiquitous in identifying the altered field of view caused by using smaller sensors in cameras along with full frame lenses. Nikon and Sony APS-C cameras yield a 1.5x crop factor, while Canon APS-C cameras have a 1.6x crop factor.Īnd, invariably, if you use the phrase “crop factor,” someone is going to yell at you and tell you that you aren’t cropping anything. Anyone that’s shot a DSLR in a remotely serious manner is aware of the crop factor for APS-C format cameras when compared to their full frame cousins.
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