Your guide to Canon camera and lens reviews

Sigma 20mm f/1.8 EX

Sigma 20mm f/1.8 EX Specifications
Frame Coverage 35mm
Lens Construction (groups) 11
Lens Construction (elements) 13
No. of Diaphragm Blades 9
Minimum Aperture 22
Closest Focusing Distance 0.20m (7.9")
Maximum Magnifcation 0.25x
Filter Diameter 82mm
Maximum Diameter x Length 88.6mm x 89.5mm (3.5" x 3.5")
Weight 520g (18.3oz)
Eric Tischer
To my eye the Sigma 20mm is identical to the Sigma 12-24mm from f/5.6 and down. Unless you need the extra speed or macro ablity, there's isn't much incentive to upgrade.
William Castleman
The EF 17-40mm f/4L lens is a very sharp, high contrast zoom lens with performance characteristics that often match and sometimes exceed those of quality prime lenses at wide angle.
Meet the Sigma 20mm f/1.8 EX DG Lens - as of this writing, Canon does not offer a lens this wide with an aperture this large. The Sigma 20mm is over 1 stop faster than the fastest Canon 20mm prime or zoom lenses (f/2.8).
Petteri Sulonen
It does something no other Canon-mount lens does -- a solid 20 mm down to f/2.8, and then over a stop more. And it's not even expensive.
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