"Medium format has traditionally referred to a film format in still photography and the related cameras and equipment that use film. Nowadays, the term applies to ...
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film and digital cameras that record images on media larger than 24 mm × 36 mm (0.94 in × 1.42 in) (full-frame) (used in 35 mm (1.4 in) photography), but smaller than 4 in × 5 in (100 mm × 130 mm) (which is considered to be large format photography).
In digital photography, medium format refers either to cameras adapted from medium-format film photography uses or to cameras making use of sensors larger than that of a 35 mm film frame. Often, medium-format film cameras can be retrofitted with digital camera backs, converting them to digital cameras, but some of these digital backs, especially early models, use sensors smaller than a 35 mm film frame. As of 2013, medium-format digital photography sensors were available in sizes of up to 40.3 by 53.7 mm, with 60 million pixels for use with commonly available professional medium-format cameras. Sensors used in special applications such as spy satellites can be even larger but are not necessarily described as medium-format equipment.[citation needed]" - (en.wikipedia.org 28.03.2020)
