|Format: APS-C (crop)|
Type: Zoom lens
Focusing: Auto Focus (AF)
Lens mounts: Canon EF, EF-S, Sony A / Minolta A, Nikon F (FX, DX), 4/3 (Four/Thirds), Pentax K, Sigma SA
First year of production: 2005
Optical design: 14/10 (3 AS, 3 SLD)
Features: Ultra-Sonic Motor
The Sigma 10-20 mm f/ 4-5.6 EX DC HSM
Diagonal angle of view 102.4º- 63.8º (1.7x Sigma SD)
Diagonal angle of view 106.6°- 67.7° (1.6х Canon EFs)
Diagonal angle of view 109.7°- 70.7° (1.5x Nikon DX)
Diameter 81 mm
Max. magnification 1:6.7
Hood (petal, bayonet, LH825-04) is included with the lens.
The Sigma 10-20mm F4-5.6 EX DC HSMis a superwide-angle 2x zoom lens, specially designed for digital SLR APS-C or 4/3 cameras, which provide their owners with a high demand range of focal lengths 15-30 mm and maximum angle up to 110°.
The optical scheme of the lens consists of three aspherical elements (two hybrid and one molded) for correction of distortion and astigmatism and three SLD elements for correction of chromatic aberration. Multi-coating of optic elements reduces flare and halation, and increases contrast.
The Hyper-Sonic Motor of the AF drive provides noiseless and high-speed focusing and the possibility of constant manual focusing without switching to the manual mode. Nikon low-end models are equipped with a built-in motor. There is no HSM for the Sony and Pentax bayonet mounts.
The system of internal focusing eliminates the front lens rotation and provides convenient use of a petal hood and polarized filters, as well as focusing at minimum distance 24 cm throughout the entire zoom range.
The lens becomes approximately 1 cm longer while zooming from 10 mm to 20 mm. .
The Sigma 10-20mm F4-5.6 EX DC HSM pros:
excellent image quality at the center of the frame,
good control of chromatic aberration,
well controlled distortion (lines are not bound),
effective and quiet autofocus,
resistant to back light,
3-5 years of warranty.
The Sigma 10-20mm F4-5.6 EX DC HSM cons:
very high vignetting throughout all focal lengths even when stopping down,
average image quality in the corners,
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Posted by: dv Date of publication: 28.10.2010