The Bower SFD 52C is a lighting system for standard and macro flash photography. It is dedicated to Canon E-TTL I / II flash systems and features fast recycling circuitry, rear curtain synchronization and an autofocus (AF) assistance beam. The SFD 52C has a zoom flash head that tilts and swivels for bounce flash at any angle. The macro photography ring light attaches to 55 and 58mm diameter lenses with included adapter rings. The ring light can be detached from the main flash unit when not in use.