The 650-1300mm f/8 Telephoto Zoom Lens for T-mount fromVivitar is a lens for both amateurs and professionals who desire an affordable extreme focal length zoom lens for wildlife, celestial or sports photography. The Vivitar 650-1300mm offers an upgraded optical design and eight multi-coated lens elements for sharp, high-contrast images with minimal flaring. A camera-specific T-mount adapter (not included) is required to attach the lens to your camera body but it is compatible with almost any film or digital SLR camera. This manual focusing lens has preset f-stops that correspond with the focal length at which you are shooting. An index for distance and diaphragm scale is inscribed on the lens barrel to coordinate focal length and aperture. The Vivitar 650-1300mm is an affordable lens with which to explore the creativity and challenges of extreme telephoto photography.