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Dec 17, 2015 at 4:20 comment added Brandon Dube @MichaelClark Given that the 50L contains an asphere, I am extremely doubtful that the undercorrected spherical aberration is intention and not simply a limit of its design.
Dec 17, 2015 at 2:22 comment added Michael C Not always true, though. The Canon EF 50mm f/1.2 L, for instance, is designed to allow uncorrected spherical aberration to give it the distinct look it is famous for. It one of the most expensive 50mm on the mass market, but far from the sharpest at the edges.
Dec 16, 2015 at 22:24 history answered Mike Sowsun CC BY-SA 3.0