GW-3 Wide Angle lens for GR II: Ricoh Talk Forum: Digital Photography Review
Amazon.com : RICOH Lens Adapter GA-2 for RICOH GR IIIx [ Used When The Tele-Conversion Lens GT-2 is Attached] [GT-2 is Automatically Detected, Cropped, and Image stabilization is Optimized. ] : Electronics
Ricoh GW-3 21mm Wide-Angle Conversion Lens 175780 B&H Photo Video
Ricoh GR Wide Angle Adaptor (GW-3): Out of the Box Impressions – SeattleSteve.me
Ricoh GR III Digital Camera, Black W/GW-4 Wide Conversion Lens, Adapter, Battery 15039 N