Polaroid 52mm Filter Thread Lens, Macro Reverse Ring Camera Mount Adapter For The Nikon D40, D40x, D50, D60, D70, D80, D90, D100, D200, D300, D3, D3S, D700, D3000, D5000, D3100, D7000, D5100, D3200, D600, D4, D800, D800E Digital SLR Cameras

The Polaroid camera lens revering ring is installed between a Nikon camera body and a lens equipped with a filter thread diameter of 52mm. The lens does not have to be a Nikon lens. Once attached to the camera the adapter ring provides 52mm male threads onto which you can attach any lens with 52mm female threads. Reversing a lens on a camera gives it macro capability-close up images without the expense of a new lens