this post was submitted on 26 Oct 2023
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Crop factor equivalency for apeture is referring to the perceived depth of field with a different lens, not the brightness.
An f/2.8 lens will shoot as fast as f/2.8 does, no matter what you put it on.
do you mean that aps-c has an advantage over full frame on in terms of shutter speed?
for example, I am shooting at 35mm at 1.4 with 1/80s on full frame at the exact same light situation where I use an an APS-C sensor at 23mm at 1.4 will I get 1/80s?
if yes, 1/80s on APS-C will more less subject motion blur?
You'll get 1/80s with the same blur since you have the same field of view. Depth of field will be different though, the FF will be shallower.
If you stop down the FF to f2, then you'll get similar depth of field, but then you'll have to raise ISO to compensate.