The Olympus Adapter Flash Ring is the perfect device that helps in connecting the RF-11, SRF-ll, or TF-22 flash units to the M.ZUIKO DIGITAL ED 50mm f2.0 Macro lens. This device is provided with a bayonet mount on one side and thread on the other side. Both the bayonet mount and thread are easy to attach. While the bayonet mount provides an interface for connecting the flash unit, the 49mm filter thread provides an interface for connecting the lens. This adapter ring is part of the Olympus flash system and plays a very important role for the 50mm prime focus macro lens.