SD1 Merrill camera incorporates 46 megapixel (4,800x3, 200x3 layers) 24x16mm APS-C X3 direct image sensor. SD1 is Sigma’s flagship digital SLR model housed in solid magnesium alloy body making it extremely lightweight with an overall nice feel and pleasant handling. Splash proof feature protects camera from effects of harsh weather conditions. Incorporating 24x16mm APS-C X3 direct image sensor, dual TRUE (Three-layer Responsive Ultimate Engine) II image processing engines and 46 megapixel sensor ensures that high resolution images are processed quickly with high definition and smooth and subtle graduation of color delivering an image size of approximately 35/45 mp in raw/tiff files. This latest technology meets strictest standards and requirements of professionals and enthusiast photographers for all types of photography. Sigma 18-200mm F3.5-6.3 DC OS is an all-purpose lens offers convenience and features on all levels. Its versatility allows photographer to capture wide angle photos such as scenic, landscape or group photography and at 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 entire zoom range. Sigma is proud to have introduced 18-200mm F3.5-6.3 as one of first of its kind. Equivalent roughly to 24 to 300mm lens in larger format cameras, this lens has an impressive range and can deliver stunning images.