Friday, October 30, 2009

Sigma f/2.8 24-70mm IF EX DG HSM



Sigma’s F2.8/24-70mm IF EX DG HSM lens offers first rate image quality in a lightweight and affordable body. Designed for use with full frame and APS-C sensor digital SLRs, as well as 35mm film cameras, this fixed aperture zoom exhibits consistently high detail resolution at all focal lengths and performs well right across the image frame – essential in a full frame lens. The Hypersonic Motor (HSM) boosts the camera’s own autofocusing system, to ensure fast reactions and that subjects are focused and tracked quickly, while high refractive index glasses in three elements allow a compact design and well controlled chromatic aberrations, even at the corners of the frame. Covering an extremely useful range of focal lengths, the Sigma 24-70mm f/2.8 IF EX DG HSM is an excellent lens for the professional and high end amateur alike.

As a member of the EX series of lenses this 3rd generation Sigma lens is designed with the highest level of optical technology and augments its predecessor with the addition of the Hyper-Sonic Motor (HSM) ensuring a quiet, high speed AF as well as full-time manual focusing capability. Housed in compact construction, the Sigma 24-70mm is a large aperture standard zoom lens ideal for all general photography including portraiture and landscapes. Physically, the shortest lens in the category, its overall length is 3.7 inches/94.7mm. With excellent optics, this could be the foremost performing lens in the category with stunning speed, clarity and color. Intricate lens construction includes Super Multi Layer Coating reducing flare and ghosting; the combination of ELD (Extraordinary Low Dispersion) and two SLD (Special Low Dispersion) glass elements and three Aspherical lenses provide excellent correction of all types of aberrations. Superior optical performance is ensured throughout the entire zoom range with the minimum focusing distance being 15in/38cm and maximum magnification ratio being 1:5.3. The rounded 9 blade diaphragm gives a natural look to backgrounds and foregrounds. Mark Amir, Sigma’s General Manager, says, "This new 24-70mm lens demonstrates Sigma’s commitment to producing lenses that offer the elusive combination of exceptional quality and high value and adds to the already wide range of critical lens selection."

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