The Sigma APO 70-200 mm f/ 2.8 EX DC OS HSM
In February, 2010 Sigma announced the Sigma APO 70-200 mm f/2.8 EX DG OS HSM. It is a telephoto fast zoom lens of the second generation with an optical stabilizer (4 f-stops), which allows you not only to shoot shorter exposures but also to see a stabilized image in a viewfinder.
Its optical scheme has two FLD ("F" Low Dispersion, analogous to fluorite glass) and three SLD elements, providing color correction and minimization of most aberrations.
When used on APS-C (crop) cameras, an equivalent focal length is 112- 320 mm.
The minimum aperture of 2.8 and the optical stabilizer enables shooting in poor lighting conditions without a tripod or a flash.
The Sigma APO 70-200 mm f/2.8 EX DG OS HSM has a rounded 9-blade aperture. It produces very beautiful blurring of out-of-focus areas (bokeh).
Thanks to a new hyper sonic motor (HSM), focusing is rather fast, silent and precise. Manual adjustment of sharpness is available.
For a convenient use of polarized and gradient filters the front lens is non-rotating.
The 1.4x EX DG APO and the 2x EX DG APO teleconverters can be optionally used to increase the range of focal lengths lens up to 98-280 mm (lens speed F4, autofocusing is possible) and 140-400 mm (lens speed F5.6, autofocusing is possible) respectively.
The Sigma APO 70-200mm f/2.8 EX DG OS HSM is a good choice for portrait, genre, candid and marriage photography. According to its characteristics, the lens is fit for many other types of photography.
The lens comes complete with a petal hood, tripod ring and a soft case. There is an additional adapter, enlarging the hood, supplied for digital APS-C cameras.
* The lens cannot be used on Pentax cameras with the 1.4x EX DG APO and the 2x EX DG APO teleconverters.
* The optical stabilizer for the Nikon F won't function on film cameras, except for Nikon F6.
* The optical stabilizer for the Canon EF won't function on film cameras, except for Canon EOS-1V.
* Both the autofocus and the system of optical stabilization won't function on Pentax film cameras and on digital * IST and K100D cameras.
* Both the autofocus and the system of optical stabilization won't function on Minolta film cameras.
* Lenses for digital Pentax and Sony have a built-in system of optical stabilization. If you want to use the Sigma OS , you should switch off a sensor-shift system of optical stabilization.
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Posted by: Sergei Borodin Date of publication: 13.08.2010