The Ricoh GH-1 Lens Hood & Adapter is a two-piece set of lens accessories for the GR Digital II and GR Digital cameras. The adapter twists & clicks onto the body, bayonet-style.
The adapter allows you to screw in a filter that has a 37mm diameter. You can also attach the lens hood to the front of the adapter. The lens hood features a ridged interior surface that's designed to deflect light.
The adapter is required for using Ricoh's GW-1 0.75x wide conversion lens or GT-1 1.43x teleconversion lens with the GR Digital and GR Digital II.