AlanF said:...Further, sometimes you can put a ~1.6x shorter focal length but wider lens with a better f-number on the APS-C to give the same resolution as a longer lens on FF but with the light on the sensor more intense (or use a Metabones speed booster).
I’m sorry but no matter how many times people try to say this is an advantage, in practical reality the Crop body always loses that scenario.
135f2 vs 200f2.8? Full Frame costs half as much and probably gives better IQ.
85f1.4 vs 135f2? Same thing, you’re looking at a more expensive lens on crop and the wide open performance at 85f1.4 isn’t anywhere as good as 135f2 on Full Frame.
50f1.0 vs 85f1.4 is an almost impossible scenario to achieve just based on the lack of f1.0 lenses, and of course moving to 50f1.4 pits the crop body against the inexpensive 85f1.8, which isn’t even a full stop disadvantage anymore.
35f1.4 vs 50f1.8, again, crop sensors lose horribly in all three metrics of Light Gathering, IQ and Cost (the smaller Crop sensor produces an extra 1 stop worth of noise and must be run at 1 stop lower ISO for equivalence, and “technically” it should be 1.3 stops to offset the sensor noise).
I’m probably going to get the Mitakon 35mm f0.95 for Fuji mount because “somehow” it’s actually sharp in the middle wide open, and doesn’t cost an arm and a leg. I’m just calling it The Chinese Miracle for now though because I don’t think anything else on the market comes that close to giving a crop sensor full equivalence for a half-decent price.
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