Sigma have announced that the APO 120-400mm F4.5-5.6 lens is now available in both Pentax and Sony mounts, supplimenting those initially available of Sigma, Nikon and Canon.
From the official announcement:
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 movement.
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.
Minimum Aperture F22 Minimum Focusing Distance 150cm
Lens Construction 21 Elements in 15 Groups Maximum Magnification 1:4.2
Angle of View 20.4°- 6.2° Filter Size 77mm
No. of Diaphragm Blades 9 pcs Lens Hood Bayonet Type
Weight 1,670g SRP £766.30
Dimensions Diameter 92.5mm x Length 203.5mm
Availability June 2010