Sigma AF 10-20mm f/4-5.6 EX DC HSM - Review / Lab Test Report
Lens Reviews - Nikon / Nikkor (APS-C)
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Review by Klaus Schroiff, published February 2007

Lens kindly provided by Michael Schmid (1st sample) and Dr. Thomas Rubach (2nd sample)!


The Sigma AF 10-20mm f/4-5.6 EX DC HSM is one of the several players in the ultra-wide zoom market. It's quite interesting that Sigma has no less than 3 ultra-wide zoom lenses in their lineup today. Besides the 10-20mm DC there's the 12-24mm f/4.5-5.6 EX as well as the 15-30mm f/3.5-4.5 EX - both full-format lenses but naturally perfectly usable on APS-C DSLRs as well. The DC (Digital Camera) part of the lens name indicates that the 10-20mm can only be used on reduced image circle (APS-C) DSLRs. The field-of-view is equivalent to about 15-30mm on a full frame camera. As such it is currently the lens with the widest corrected focal length setting for Nikon APS-C DSLRs (not counting fish-eye lenses) ... for now at least.

The build quality of the lens is very impressive - it feels like a solid block. The typical EX finish (smooth crinkle style) feels very pleasant and the zoom and focus control rings are very smooth and well damped. The lens extends marginally when zooming towards the long end of the range.

Note: the sample shot above shows the variant in Canon EF mount

The lens has a very fast and near-silent HSM (hypersonic motor) AF drive which provides full-time manual focusing in single-shot AF mode. Unlike the AF-S Nikkors there´s no dedicated AF/MF switch on the lens.

Equiv. focal length15-30 mm (full format equivalent)
Equiv. aperturef/6-f/8.4 (full format equivalent, in terms of depth-of-field)
Optical construction14 elements in 10 groups inc. 3 SLD and 3 aspherical (1x molded, 2x hybrid) elements
Number of aperture blades6
min. focus distance0.24 m (max. magnification ratio ~1:6.7)
Dimensions84 x 81 mm
Weight470 g
Filter size77 mm (non-rotating)
Hoodsupplied, petal-shaped, snap-on type
Other features-

Last Updated on Thursday, 12 August 2021 15:51

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