This Danubia 500 f/8 Telephoto Lens with a T2 universal connection is a relatively cheap way of having fun with long foal lengths and great for sports or nature photography. It has a maximum aperture of f8.0 and focuses down to 10m, so not designed for close focus objects. The f 8 aperture maens that the lens will only focus on manual modes, but can be attached to most Digital SLR cameras by using the relevant T2 mount (not included). The lens measures approximately 298mm overall and has a focal length of 500mm. The Danubia 500 f/8 Telephoto Lens has a tripod ring with a 1/4" female thread for attaching to tripod heads.