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Sigma APO 120-400mm F4.5-5.6 DG OS HSM - The Sharp Telephoto Zoom Lens

Sigma is a Japanese company well known for lenses, cameras, flashes and other photographic accessories. Sigma introduced a telephoto zoom lens with an optical stabilizer function called Sigma APO 120-400mm F4.5-5.6 DG OS HSM SLR (Single Lens Reflex) lens. It provides very fast and accurate photography.

The dimension of this lens is 92.5 x 203.5 mm (3.6 x 8 inches). The lens gets constructed with a combination of 21 elements in 15 groups. The focal length of the lens is 120 to 400 mm. The minimum aperture range of this lens is f/22. The maximum aperture range is f/4.5 to f/5.6. The angle of view capacity for this APO 120-400mm F4.5-5.6 will be 6.2 degrees to 20.4 degrees. The minimum focusing distance of this lens is 150 cm (59.1 inches). The maximum reproduction ratio of this lens is 1:4.2.

This APO 120-400mm F4.5-5.6 DG OS HSM lens is compatible with Sigma APO teleconverters. It includes three Special Low Dispersion (SLD) glass elements which provide excellent image quality throughout the zoom range. The filter attached to this lens is 77 mm in size. The lens contains nine aperture blades in it. The additional optical 1.4x EX DG APO or 2x EX DG APO teleconverters produce either a 168 to 560 mm F6.3 to F8 manual focus ultra telephoto zoom lens or a 240 to 800 mm F9 to F11 manual focus ultra-telephoto zoom lens respectively.

The Hyper-Sonic Motor (HSM) works quiet and offers high speed autofocus. The Optical Stabilizer (OS) function provides the user to use shutter speed four times faster than the actual one. The chromatic aberration (CA) gets corrected by the special low dispersion glass elements. The rear focus system gives high quality images. It contains a superb multi-layer coating which reduces the ghosting and flare. It uses a bayonet type of lens hood for mounting the lenses. The corresponding AF mounts to this lens are Sigma, Canon, Pentax, Nikon and Sony.

APO 120-400mm F4.5-5.6 DG OS HSM lens works pretty well in close-up photography. The supplied accessories comes with this lens are lens case, lens hood (LH830-01), shoulder strap and tripod socket (TS-31). The lens weighs 1750 grams (61.7 ounces). This APO 120-400mm F4.5-5.6 lens has a perfectly designed mount and the lens is nicely finished. The features available with this lens are good and work well. Overall Sigma APO 120-400mm F4.5-5.6 DG OS HSM is a decent lens for all the photographers.

dBal
Sun, 28 Feb 2010 10:23:15 +0000

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