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The following is an unedited press release, shown as received from the company represented. We've elected to present selected releases without editorial comment, as a way to provide our readers more information without further overtaxing our limited editorial resources. To avoid any possible confusion or conflict of interest, the Imaging Resource will always clearly distinguish between company-provided press releases and our own editorial views and content.

Sigma's 18-50mm F2.8-4.5 DC OS HSM lens. Photo provided by Sigma Corp. PRESS RELEASE: SIGMA announces 18-50mm F2.8-4.5 DC OS HSM

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
Sigma's 18-50mm F2.8-4.5 DC OS HSM lens. Photo provided by Sigma Corp. Click for a bigger picture!
Petal-type Hood (LH730-02) supplied
Specification(For Sigma mount)
Lens Construction 16 Elements 12 Groups
Maximum Magnification 1:4.1
Angle of View 69.3°-27.9°
Filter Size Φ 67mm
Number of blades 7pcs
Lens Hood Petal-type hood
Minimum Aperture F22
Minimum Focusing Distance 30cm / 11.8in
Dimensions Φ 74mm × 88.6mm / 2.9” x 3.5”
Weight 395g / 13.9oz.
Corresponding AF Mounts
  • Vignetting will occur if the lens is used with 35mm SLR cameras or digital cameras with image sensors larger than APS-C size.

  • For Pentax mount, if the camera body does not support HSM, auto focus will not be available.

(First posted on Monday, March 2, 2009 at 20:00 EST)

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