Digital medium format. If you’re already confused with the whole ‘full-frame’ equivalent terminology, then this is going to confuse you even more. Let’s just say that in the days of film, 35mm (24mm x 36mm) was the most common format to use. 95% of all cameras were in this format. Once we went digital, it made the most sense to reference this format as the universal standard in terms of how we refer to the focal length of a lens. The problem is, not all the sensors were the same size. Welcome to the crop factor phenomena. An 18.5mm lens in the APS-C format (24mm x 16mm) gives the approximate field of view of a 28mm on the 35mm format. Now let’s confuse you with digital medium format. In the old film days, medium format meant that a camera took either 120 or 220 film. This format is actually older than 35mm, but Leica made sure that the 35mm would eventually become the standard film type. Medium format film is 2.25″ or 6cm in width, with 120 film being half the length of 220 film. For i
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