PMA 2007: The second new lens from Sigma is the 18-200mm F3.5-6.3 DC OS. As the OS acronymn suggests, it has Sigma’s own unique OS (Optical Stabiliser) function. This function uses two sensors inside the lens to detect vertical and horizontal movement of the camera and works by moving an optical image stabilizing lens group, to effectively compensate for camera shake. The Sigma 18-200mm OS lens will cost £439.99 in the UK, availability to be announced.

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