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Canon EF 20mm f/2.8 USM
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Canon EF 20mm f/2.8 USM

The Canon EF 20mm f/2.8 USM is a fairly large lens, but also fairly light at just about one pound with lens shade (not supplied with the lens).

Prime lenses (fixed focal length) can be better performers than zooms because they can be optimized for just one focal length. That is, if they are optimized, as opposed to a lackluster design.

The field test on the following page shows that the 20/2.8 delivers murky somewhat better results than the Canon EF 16-35mm f/2.8L II, depending on where in the frame one compares, and the focusing distance.

Performance of this lens is marginal compared to the Zeiss 21mm f/2.8 Distagon, as might be expected, since it costs 1/4 the price.

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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.

DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.

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