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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 APO 120-400mm F4.5-5.6 DG OS HSM lens. Courtesy of Sigma, with modifications by Michael R. Tomkins. PRESS RELEASE: 120-400mm F4.5-5.6 DG OS HSM for the Sony and Pentax Mounts

May 14, 2010 -- The Sigma Corporation is pleased to announce the launch of the new APO 120-400mm F4.5-5.6 DG OS HSM for Sony and Pentax cameras.

This telephoto zoom lens incorporates Sigma’s original OS (Optical Stabilizer) function. It offers the use of shutter speeds approximately 4 stops slower. As compensation for camera shake is visible in the viewfinder, the photographer can easily check for accurate focus and ensure there is no subject movement. Three SLD (Special Low Dispersion) glass elements provide excellent correction for chromatic aberration. This lens is equipped with the rear focus system that minimizes fluctuation of aberration caused by focusing, providing optimum image quality throughout the entire zoom range.

The super multi-layer coating reduces flare and ghosting. The minimum focusing distance of 150cm (59.1”) throughout the lens’ zoom range produces a maximum magnification of 1:4.2, making it useful for close-up photography. This lens incorporates HSM (Hyper Sonic Motor) which ensures a quiet and high-speed AF as well as full-time manual focusing capability. The addition of the optional 1.4x EX DG APO or 2x EX DG APO Tele Converters produce a 168-560mm F6.3-8 MF ultra-telephoto zoom lens or a 240-800mm F9-11 MF ultra-telephoto zoom lens respectively (For Sony fitting only).

Case, Hood (LH830-01), shoulder strap, Tripod socket (TS-31) supplied


Lens Construction 21 Elements in 15 Groups
Angle of View 20.4-6.2 degrees
Number of Diaphragm Blades 9pcs
Minimum Aperture(W) F22
Minimum Focusing Distance 150cm / 59.1in
Maximum Magnification 1:4.2
Filter Size Diameter 77mm
Dimensions Diameter 92.5mm x Length 203mm / 3.6in. x 8in.
Weight 1,670g / 58.9oz.
  • The Pentax mount Tele Converter is not compatible with this particular lens.

  • It is not possible to use AF and the stabilizer function (OS) when attaching to film SLR, Pentax ist* series and K100D DSLR cameras.

(First posted on Saturday, May 15, 2010 at 00:54 EDT)

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