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Field illumination (vignetting)

Field illumination is noticeably more even than the EF 50mm f/1.4, and compares very favorably to the Canon EF 50mm f/1.2L, even when the 50/1.2L is stopped down to f/1.4, quite remarkable.

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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

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Sigma 50/1.4 @ f/1.4, f/2
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