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The part thats gets me is, how this calculation can be true for different apertures.. i would totally get this if we were talking the same apertures (100mm only), but we have 2 different apertures 100mm & 120mm. I just cant get my head around how that one formula can be good for any 2 different apertures. Say a 50mm and a 1000mm, both were f/2. This calculation breaks here.. because 2^2/2^2 = 1. They both cant catch light at the same speed.. the 1000mm would be so much faster..
Last edited by Emuhead; 11-05-2020 at 06:25 PM.
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