Fotodiox 52mm -52mm, 52-52mm Macro Close-up Reverse Ring, Anodized Black Metal Ring, for Nikon, Canon, Sony, Olympus, Pentax, Panasonic, Samsung Camera 52-67mm Reverse Ring
Reverse ring allows you to mount two lens front to front via filter thread for extreme macro close-up photography. Reversing the lens greatly increases the macro reproduction capabilities