Pre-PMA 2008: Sigma has announced an optically stabilized 120-400mm f/4.5-5.6 lens. The lens will be available for owners of Sigma, Canon, Nikon, Pentax and Sony DSLRs. A maximum magnification of 1:4.2 also makes it useful for users who want to get a little closer. The DG designation means the lens will work equally happily on 35mm or APS format SLRs.

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Press Release:

APO 120-400mm F4.5-5.6 DG OS HSM

High ratio zoom lens housed in a compact construction and incorporating Sigma’s original OS (Optical Stabilizer) function.

The Sigma Corporation is pleased to announce the launch of the new APO 120-400mm F4.5-5.6 DG OS
HSM.

  • Incorporating Sigma’s original OS (Optical Stabilizer) function.
  • Three SLD glass elements and a rear focus system provide optimum image quality throughout the entire zoom range.
  • Super multi-layer coating reduces flare and ghosting.
  • The minimum focusing distance of 150cm (59.1”) makes it useful for close-up photography.
  • HSM ensures quiet and high speed autofocus.
  • Compatible with Sigma’s APO Tele Converters.

This telephoto zoom lens incorporates Sigma’s original OS (Optical Stabilizer) function. It offers the equivalent of using a shutter speed approximately 4 stops faster. 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. It provides optimum image quality throughout the entire zoom range.

The super multi-layer lens coating reduces flare and ghosting. High image quality is assured throughout the entire zoom range. The minimum focusing distance of 150cm (59.1”) throughout the entire zoom range and has a maximum magnification of 1:4.2 make 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 optical 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.
*1 OS function is not available.
*2 If the camera body does not support HSM motor, AF does not work.

Sigma lens specifications

Lens name APO 120-400mm F4.5-5.6 DG OS HSM
Focal length 120-400mm
Maximum aperture f/4.5-5.6
Minimum aperture f/22
Lens construction 15 groups 21 elements
Angle of view 20.4°-6.2°
Closest focus distance 150cm / 59.1in
Maximum reproduction ratio 1:4.2
Aperture blades 9
Filter attachment size 77 mm
Focusing HSM motor with manual focus override
Dimensions 92.5mm×203.5mm (3.6in × 8in)
Weight 1,750g (61.7oz)
Supplied accessories • Case
• Hood (LH830-01)
• Shoulder strap
• Tripod socket (TS-31)