On this page are compared the 24/1.4L II and the 16-35/2.8L II. These are two radically different lenses, designed for different purposes, yet there is no doubt keen interest at 24mm as to which lens can deliver the best results. The two lenses are very similar in size and weight, and so for that “price”, we can hope that the 24/1.4L II will deliver superior results if we are to carry it in our bag.
The test subject is planar (flat). Obviously, a lens with field curvature is going to find off-center detail a challenge, and both of these lenses have field curvature. Stopping down mitigates the problem for both lenses; the naive user will conclude simply that the lens is soft off-center (or soft in the center depending on focus). Most real 3D subjects are more forgiving, but see Varying Sharpness. Landscape shooters should exercise care with subjects involving distant horizons; these will be blurred off-center unless the lens is stopped down to f/8 - f/11 (observed in quite a few field shots).
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