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Teus
!QbSstcPD6U
hard to say. any aperture wider than f/2.8 requires a great deal of attention to work with.
lets say you shoot with a 50mm f/1.4 lens. at f/1.4 you will have some vignetting and softness, most of it will be gone at f/2-f2.8.
a 50mm f/1.8 will start to get sharp at f/2.8-f4. a 50mm f/1.2 will be useable at f/2.
next to that you have to watch out you focus properly. the faster the lens, the smaller the DOF. a 50mm f/1.4 wide open will give less DOF than the 50mm f/1.8 wide open, and you'll need to focus properly. when you stop down to f/2, the f/1.4 will have better focus than the f/1.8
when it comes to high ISO, resolution of your sensor/film drops so you can get away with wider apertures (the drop in sharpness will not be so visible), just watch out for vignetting and flare. you can get away with a good 50mm at f/2 or f/2.8 on ISO800 easily, if you focus properly
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