The Vivitar 500mm f/6.3 Mirror Lens is an ultra-telephoto manual focus lens which, due to its mirror design, is extremely compact and lightweight for its focal length. This is achieved by using an advanced reflex design. The drawback to this is that only one fixed aperture is possible, and only in manual focus and manual exposure modes. This lens is ideally suited for outdoor photography. It has a fixed aperture of f/6.3.
This lens uses a T-mount adapter (not included).