Neewer 52mm Filter Lens Reverse Mount Adapter for Canon EOS 7D, 550D/T2i, 1100D/T3, 450D/Xsi, 50D, 40D You will be able to mount most 52mm filter-threaded lenses (any brand) reversely on Canon EOS cameras such as the followings:Completely manual control, manual focus and manual exposure It is extremely effective for macro photography. Not Focus to Infinity;No electrical connection There is no ROM connection on the ring so diaphragm control of the lens is set manually. Equipped with lock & stop pin; Made of aluminum with High Quality.