This Scubalamp Adapter is compatible with the Sea & Sea YS-D2 Strobe. It is used to attach the Scubalamp OSD Optical Snoot stepless shaping device to the Sea & Sea YS-D2 Strobe. There are other adapters available for different strobes.
Each adaptor consists of a plastic collar that clips onto the front of the strobe, which is then tightened by a metal clamp that fits over it. The OSD fits onto a bayonet mount on the plastic collar and locks in place with a spring-loaded button. It is easy to remove the OSD on a dive, should you wish to take a photo without a snoot effect.