The Nikon Reflex-Nikkor 500mm f8 is a reflex telephoto lens for Nikon F mount. A mirror lens provides tremendous reach in a relatively small, lightweight package: this lens weighs about 830g and measures less than 13cm long, which ain’t bad for a 500mm. Includes an A2 rear filter- that’s a mild warming filter- and the HN-27 lens hood. This lens is the 2m focusing version.