The Bower SDF 52N is a lighting system for standard and macro flash photography. It is dedicated to Nikon I-TTL flash systems, and features fast recycling circuitry, rear curtain synchronization, and an autofocus (AF) assistance beam. The SDF 52N has a zoom flash head that tilts and swivels for bounce flash at any angle. The macro photography ring light attaches to 58 and 67mm diameter lenses with included adapter rings. The ring light can be detached from the main flash unit when not in use.