>>4188906The point of larger apertures is 100% not using them. You see, a lens that is wide open will always have more aberrations. Always. But if you stop it down, it will have LESS aberrations than a lens that is wide open at that stopped down aperture, assuming it is as well designed.
It is possible to design slower lenses that are almost as good as a faster lens that is stopped down, but compare the sony 40mm f2.5 G and 35mm f1.4 GM for example... the stopped down, faster lens is sharper at f2.5 than the wide open f2.5, and only gets sharper, while the 2.5 only gets sharper at slower apertures. By f2.8, the f1.4 lens is nearly as sharp in the far corners as the f2.5 is sharp in the center wide open, which to the human eye is as sharp.
