Good Function: The macro lens reverse ring adapter can make any 52mm lens become the marco lens on the camera body, and greatly increase the macro reproduction range. 52mm Thread: The protection ring has 52mm thread, which allows you to install any 52mm filter, such as UV, CPL. Protection Function: When you reverse the lens, the protective ring can protect the rear lens mounting part and electronic part from accidental damage Two Sizes Thread: One side of the thread is suitable for the filter thread of the lens, and the other side has a bracket similar to the back lens bracket of the camera. Applicable Model: 52mm macro lens reverse ring adapter is compatible for Nikon F AI AF mount camera and lens.