Fotodiox 49mm - 52mm, 49-52mm Macro Close-up Reverse Ring, Anodized Black Metal Ring, for Nikon, Canon, Sony, Olympus, Pentax, Panasonic, Samsung Camera
Price 9.95 USD
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