The 55-200mm f/4.5-5.6 DC lens was exclusively designed to suit the characteristics of digital SLR cameras. Ideal as a full-range telephoto zoom lens. lenses are exclusively designed for digital SLR cameras. The image circle (rear of lens) is made to match the smaller dimensions used for the image sensor on digital cameras. As a result these lenses are also more compact and lightweight, and are better matched to digital SLR cameras.
