The Sigma 18-200mm F3.5-6.3 DC OS is an all-purpose lens offers convenience and features on all levels. Its versatility allows the photographer to capture wide angle photos such as scenic, landscape or group photography and at the telephoto end is great for sports action. Portraits are also within these lenses capabilities. Compact and lightweight it's easy to carry and it will always deliver amazing images. Three Aspherical glass elements offer correction for distortion, special low dispersion glass provides optimum color correction and sharpness, super multi-layer lens coating reduces flare and ghosting and assures high image quality throughout the entire zoom range. Sigma is proud to have introduced the 18-200mm F3.5-6.3 as one of the first of its kind. Equivalent roughly to a 24 to 300mm lens in the larger format cameras, this lens has an impressive range and can deliver stunning images. This truly groundbreaking SD1 Merrill camera incorporates a 46 megapixel (4,800x3, 200x3 layers) 24x16mm APS-C X3 direct image sensor. The SD1 is Sigma’s flagship digital SLR model housed in a solid magnesium alloy body making it extremely lightweight with an overall nice feel and pleasant handling. The splash proof feature protects the camera from the effects of harsh weather conditions. Incorporating a 24x16mm APS-C X3 direct image sensor, dual TRUE (Three-layer Responsive Ultimate Engine) II image processing engines and the 46 megapixel sensor ensures that high resolution images are processed quickly with high definition and a smooth and subtle graduation of color delivering an image size of approximately 35/45 mp in raw/tiff files. This latest technology meets the strictest standards and requirements of professionals and enthusiast photographers for all types of photography.