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Anonymous
>>292183 f2.5 of a 250mm lens, not a 200mm lens, with your numbers.
Using that calculator, a 200mm lens at f2.0 on a fullframe digital or 35mm frame, 24mm x 36mm, would be THE SAME as an Olympus 4/3 sensor, 17.3 x 13.0mm, using a 100mm lens at f1.0, which would be quite impressive indeed.
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