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The Sigma 18-200mm f/3.5-6.3 DC OS HSM is the latest in the company's long line of superzooms, which stretches back to the early 1990s and a series of 28-200mm (and later 28-300mm) lenses for 35mm SLRs. In fact Sigma was the first company to produce a superzoom for the burgeoning budget DSLR market, with its 18-125mm D3.5-5.6 DC of August 2004, followed shortly after by an 18-200mm F3.5-6.3 DC in February 2005. However the big problem with long, slow zooms is image blur due to camera shake, and in March 2007 Sigma duly announced this new version of the 18-200mm with the addition of 'Optical Stabilization' (OS) technology for Canon, Nikon and its own SD range of DSLRs (Sony and Pentax users, of course, benefit from sensor-shift image stabilization of all lenses). In somewhat curious fashion, the Nikon mount version also sports an ultrasonic-type 'HyperSonic Motor' (giving rise to the HSM tag,) while the Canon and Sigma mount models use a conventional micro-motor for focusing.
Like all superzooms the Sigma 18-200mm OS features a complex optical design, in this case 18 elements in 13 groups including one Super-Low Dispersion (SLD) glass element, and no fewer than three aspherical elements to combat aberrations. A minimum focus distance of 0.45m through the entire range adds to the lens's all-round versatility. The optical stabilization system detects when the camera is panning and automatically switches to operating in one axis only, useful for shooting moving subjects such as sports.
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item in excellent condition 9 /10 with rear cap , filter and hood .
7 DAY MONEY BACK GUARANTEE IF THE ITEM IS FAULTY
