PMA 2009: Sigma has announced an ultra-wide angle zoom, the 10-20mm F3.5 EX DC HSM. This new design squeezes a relatively fast F3.5 constant maximum aperture into a body about 10% larger in each dimension than the company's popular 10-20mm F4-5.6 EX DC HSM. The lens has a minimum focus distance of 24 cm (9.4 inches) throughout the zoom range, and features two Super-Low Dispersion glass and two Extraordinary-Low Dispersion glass elements for the correction of chromatic aberrations. It is designed for cameras with APS-C/DX sensors, and will be available in mounts for Sigma, Canon, Nikon, Sony and Pentax DSLRs.

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Press Release:

SIGMA 10-20mm F3.5 EX DC HSM

March, 2009: The Sigma Corporation is pleased to announce the new SIGMA 10-20mm F3.5 EX DC HSM. This super-wide angle lens has a maximum aperture of F3.5 throughout the entire zoon range. Its wide angle of view from 102.4 degrees produces striking images with exaggerated perspective. The maximum aperture of F3.5 is ideal for indoor shooting and it enables photographers to emphasize the subject. Two ELD (Extraordinary Low Dispersion) glass elements and a SLD (Special Low Dispersion) glass element provide excellent correction of color aberration. Four aspherical lenses provide correction for distortion and allow compact and lightweight construction. The Super Multi-Layer coating reduces flare and ghosting. High image quality is assured throughout the entire zoom range. The incorporation of HSM (Hyper Sonic Motor) ensures a quiet and high-speed AF as well as full-time manual focusing capability. This lens has a minimum focusing distance of 24cm (9.4 inches) throughout the entire zoom range and a maximum magnification ratio of 1:6.6. The lens design incorporates an inner focusing system. It eliminates front lens rotation, making the lens particularly suitable for using the Petal-type hood. The Petal-type hood blocks extraneous light and reduce internal reflection.

Sigma 10-20mm F3.5 EX DC HSM specifications

Focal length 10-20mm
Maximum aperture f/3.5
Minimum aperture f/22
Lens construction 13 elements / 10 groups
Angle of view 102.4° - 63.8°
Closest focus distance 24cm / 9.4in
Maximum reproduction ratio 1:6.6
Aperture blades 7
Filter attachment size 82 mm
Lens Mount Sigma, Canon, Nikon(D), Sony(D), Pentax
Dimensions 87.3mm × 88.2mm (3.4in × 3.5in)
Weight TBC
Supplied accessories • Case
• Petal-type Hood