The EF 24-70 / 2.8L was replaced by this lens on my EOS 5D since its weight and lack of a long focus didn't work for me, but now that I have upgraded to an EOS 6 and am pleased with its image quality, I find it to be subjectively superior to that of the 24-70 (and is roughly equal to 50/1.4 @ f/8). mm allows you to shoot comfortably in the mountains, as well as, to some extent, mm, the upper left corner of the frame is the darkest, mm FR, then the auto-correction of distortion must ALWAYS be turned off, otherwise the figures and faces will noticeably swell; this is not a drawback for a lens of this purpose. (It's also best practice to avoid placing individuals on the extreme edges of the frame when shooting with a wide-angle lens.) While I find the vignetting on my EF 50/1.4 and 24-70/2.8L to be pleasing and even beneficial (brightness gradually decreases from the center to the edge), the vignetting on this lens is very sharply defined, making it unsuitable for portraiture. However, given the lack of other options (standard zoom from 4x, stabilizer), I am generally pleased with the purchase and am using the lens to accomplish the goals I originally set out to achieve.
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