Sigma’s fastest ultrawide zoom also offers an HSM motor for extremely quiet AF. Distortion control at longer focal lengths, and vignetting at the widest, were spectacular.
Sigma's widest nonfisheye and fastest ultrawide zoom, the constant-aperture 10-20mm f/3.5 belongs to the EX family of sturdily built, optically gifted Sigmas. To control multiple forms of aberration, it uses three low-dispersion glass elements and four aspheric elements-the most of any Sigma.
A 15-30mm equivalent on most DSLRs, it joins Sigma's slower and less expensive 10-20mm f/4-5.6 EX ($480, street), which stays in the lineup.
|Range:||Super wide angle |
|Full-Time Manual Focus Override:||No|
|Minimum Focal Length:||10 mm|
|Maximum Focal Length:||20 mm|