Front and rear views of a Canon EF50mm f/1.4 USM. The EF 50mm lenses are a group of normal prime lenses made by Canon that share the same focal length.These lenses are based on the classic double-Gauss lens, with the f/1.8 being a standard six-element double-Gauss with an air gap and powers between element 2 and 3 and its faster cousins adding additional elements.
Canon's new fast aperture prime lens: the EF 24mm f/ 1.4L II USM. Replacing the EF 24mm f/ 1.4L USM, the EF 24mm f/ 1.4L II USM has been completely redesigned to provide an exacting partner lens to Canon's new EOS digital SLRs, the EOS 50D and EOS 5D Mark II. Featuring a 13-element, 10-group lens, the EF 24mm f/ 1.4L II USM is designed to
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