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OpticalLimits7.3 It's super-sharp in the image center and if you avoid f/2.8 the borders/corners are decent. Lateral CAs are generally not an issue. Image distortions are extremely low for a lens of this focal length. The primary weakness is vignetting which is rather extreme at max aperture, at medium aperture settings, it's a lesser issue. Flare in strong contra-light can produce quite a bit of glare. All-metal construction and tight control rings.