Reviews and Problems with Canon EF 24mm f/1.4L USM
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lens has a flaw
Scott Allen, Amazon
25 December 2011
Summary: All the L lenses that I have tested are awesome, except this one. The lens has severe front focus (about 1.5-2.5 inches depending on the copy) at around f1.8. Some people call it soft focus but it is really a front focus issue if you know how to test for it. I bought and returned four of these trying to get a good one, only to find that it is a design flaw.