645 Lens 35mm Equivalents
May 2009 More Pentax Reviews
645 film (56 x 41.5mm) has 2.6 times the area of full-frame 35mm (36 x 24mm), or a 0.62075x crop factor.
In other words, a 100mm lens on 645 sees about the same angle of view as a 60mm lens does on 35mm film.
Here's the chart:
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