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enThe Canon 50mm f/1.2 L lens has been somewhat controversial. Perhaps the most accurate review is that of Bryan Carnathan, who claims that it is better than other lenses in this range from f/1.2 to about f/2.8 and has superb bokeh. If you’ll be shooting stopped down past f/2.8 you may be better served by the Canon 50mm f/1.4, but for wide aperture shots, this lens is the choice.
Please note: This is an f/1.2 aperture lens. It will almost certainly require autofocus microadjustment on your camera to give you sharp images wide open. If your camera does not have that feature, or you are not comfortable using it, please don’t rent this lens. If you are not used to working with wide-aperture lenses, please read this link before deciding if this is a good choice for you.
(*) The plane of focus is not flat; it’s slightly curved. Focus-recomposing will guarantee you an out of focus shot. Just don’t do it.
(*) The 50 f/1.2 L exhibits focus-shift for near distance shots, meaning that shooting objects a few feet away between f/2 and f/4 the lens will probably not autofocus accurately. At f/1.2 it’s accurate, and by f/5.6 the depth of field is wide enough that you won’t see the effect.