Charles 46277 wrote:
I use small apertures for landscapes, cityscapes, and any other scapes, and I never heard of a lens that was weak at the edges at small apertures (even bargain brands). Any Canon L lens ought to be good enough for anybody. The justification that some softening at the edges is all right with some fast lenses is that the large, fast aperture is generally used where the subject is in the center and the edges don't matter--portraits, sports, animals, people in the news, candid shots in dim light.
Not to mention that with large apertures the edges are where the greatest DoF is concentrated, so the edges are pretty much COMPLETELY blurred out and can't be seen!!!