Sigma UK has announced its APO 120-400mm f/4.5-5.6 DG OS HSM optically stabilized lens will be available soon in Sony and Pentax mounts. Currently available in Canon, Nikon and Sigma mounts, the Pentax version will start shipping from May 21, 2010 followed by the Sony version from May 28, 2010 at a suggested retail price of £766.30.

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Press Release:

120-400mm f/4.5-5.6 DG OS HSM in Pentax and Sony fit

Telephoto zoom lens incorporating Sigma’s original Optical Stabiliser

May 14,2010: The Sigma Corporation is pleased to announce that an optically stabilised version of the APO 120-400mm F4.5-5.6 DG HSM lens is now available in Sony and Pentax fit.

Sigma’s original OS (Optical Stabiliser) system allows the use a shutter speeds approximately 4 stops slower than would otherwise be possible. The effect of lens based stabilisation is visible through the viewfinder so allows the photographer to easily check for accurate focus and ensure there is no subject

Three SLD (Special Low Dispersion) glass elements provide excellent correction for chromatic aberration.  This lens is equipped with the rear focus system that minimises fluctuation of aberrations 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  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 focus override.

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.

  • Incorporates Sigma’s original OS (Optical Stabiliser) system
  • Special Low Dispersion glass elements
  • Inner focusing system
  • HSM (Hyper Sonic Motor) motor and full time manual focus
  • Minimum focusing distance of 150cm at all focal lengths

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

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)