Sigma has launched the Sigma APO 120-400mm f4.5-5.6 DG OS HSM in Sony and Pentax mounts. Incorporating a Hyper Sonic Motor for fast and quiet focussing and optical image stabilisation for blur-free handheld images, the Sigma APO 120-400mm f4.5-5.6 DG OS HSM is constructed of 21 lens elements arranged in 15 groups. Of these, three are Special Low Dispersion glass elements that have been implemented to combat chromatic aberrations. This lens is equipped with a rear focus system and features super multi-layer coating that reduces flare and ghosting. The Sony version is compatible with the 1.4x EX DG APO and 2x EX DG APO teleconverters that provide additional reach, albeit at a light loss of 1 and 2EV, respectively, meaning the autofocus system cannot be used when the lens is mounted to the camera in combination with either of these teleconverters.

Sigma Press Release

120-400mm F4.5-5.6 DG OS HSM for Sony and Pentax

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).

THE SPECIFICATIONS (For Sony mount)

*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×Length 203mm / 3.6in.×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.

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