PMA 2009: Sigma has unveiled a new large aperture image-stabilized standard zoom, in the shape of the 18-50mm F2.8-4.5 DC OS HSM. This lens features a new Optical Stabilization unit which Sigma claims will work on Sony and Pentax bodies with in-body stabilization systems. It also boasts a larger maximum aperture than the kit zooms typically supplied with most DSLRs, and incorporates Sigma's Hypersonic motor for fast silent autofocus. Designed for DSLRs with APS-C/DX sized image sensors, it will be available in Sigma, Canon, Nikon, Sony and Pentax mounts.

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Press Release:

SIGMA 18-50mm F2.8-4.5 DC OS HSM

March, 2009: The Sigma Corporation is pleased to announce the new SIGMA 18-50mm F2.8-4.5 DC OS HSM. This large aperture standard zoom lens incorporates Sigma’s original Optical Stabilisation function. This lens offers a large aperture of F2.8 at 18mm wide angle.

This large aperture and anti-shale function is ideal for indoor photography and in low lighting condition. For Sony and Pentax mount, the built-in OS function of this lens can be used even if the camera body is equipped with an anti-shake function. As compensation for camera shake is visible in the view finder, the photographer can easily check for accurate focus and ensure there is no subject movement.

Two SLD (Special Low Dispersion) glass elements and three aspherical lenses provide excellent correction for all types of aberrations. The Super Multi-Layer Coating reduces flare and ghosting. High image quality is assured throughout the entire zoom range. The lens design incorporates inner focusing and inner zooming systems.

The overall length of the lens does not change during focusing and zooming, ensuring convenient handling. This lens has a minimum focusing distance of 30cm (11.8 inches) throughout the entire zoom range and a maximum magnification ratio of 1:4.1. The incorporation of HSM (Hyper Sonic Motor) ensures a quiet and high speed AF.

SIGMA 18-50mm F2.8-4.5 DC OS HSM specifications

Focal length 18-50mm
Maximum aperture f/2.8 - f/4.5
Minimum aperture f/22
Lens construction 16 elements / 12 groups
Angle of view 69.3°-27.9°
Closest focus distance 30cm/11.8in
Maximum reproduction ratio 1:4.1
Aperture blades 7
Filter attachment size 67 mm
Lens Mount Sigma, Canon, Nikon(D), Sony(D), Pentax
Dimensions 74mm × 88.6mm (2.9 in × 3.4in)
Weight 395g/13.9oz.
Supplied accessories • Case
• Petal-type Hood