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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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.
|Optical construction||14 elements in 10 groups inc. 3 SLD and 3 aspherical (1x molded, 2x hybrid) elements|
|Number of aperture blades||6|
|min. focus distance||0.24m (max. magnification ratio ~1:6.7)|
|Filter size||77mm (non-rotating)|
|Hood||supplied, petal-shaped, snap-on type|
Last Updated on Thursday, 31 March 2011 10:30