The Sunpak DX8R, GX8R, and RH-1 (Auto 622) ring flash heads can be mounted on both macro/micro and standard lenses. This is the small "hood" that is used to prevent flare in the images if the flash head is used with standard lenses. This accessory was supplied with GX8R, DX8R, and RH-1 kits, but may be missing from older units.