Kiwifotos Lens Mount Adapter: Allows Nikon F-Mount Lenses to be used on Sony Alpha NEX camera body. This works well with my Sony NEX-5 camera body and the 3 Nikon fit film camera lenses I own. MOST IMPORTANT is registration is spot on, so lenses focus at infinity and not beyond or short of infinity. My Tamron f8/500mm catadioptic becomes equivalent to a 1000mm lens on 35mm film. It's amazingly powerful. My Nikon Micro Nikkor f3.5/55mm I plan using with extension tubes for a particular kind of work and I can use my Vivitar f2.8/24mm lens as a "standard" lens with the NEX. Yes, I know it's manual focus and stopdown (anyway, catadioptic lenses don't stop down), but hey, at this price and occasional use, who cares!!!