Amazon.com : JJC AR-GR3 Lens Filter Adapter Replaces Ricoh GA-1 for Ricoh GR III GRIII GR3 Digital Camera with GW-4 Wide Conversion Lens or 49mm Filter : Electronics
Ricoh GR III Digital Camera, Black W/GW-4 Wide Conversion Lens, Adapter, Battery 15039 N
Amazon.com : GW-4 Wide Conversion Lens for GR III Digital Compact Camera : Electronics
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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