This 500mm f/8.0 Telephoto T-Mount Lens from Rokinon is a tremendous lens for anyone shooting at a distance from their subject, including sports and wildlife photography. It's lightweight (22.6 oz/641 g) and compact (just 11.7"/29.7cm long) and it focuses as close as 33' (10m). The aperture range is f/8.0 to f/32.0. This manual focus lens has an aluminum alloy body with Diamond Black finish, with fully multi-coated low-dispersion optical glass, with a 67mm front filter thread. A T-ring adapter (available separately) is required to mount this lens to a camera body.