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Ricoh/Pentax Ricoh Wide Conversion Lens GW-4 for Ricoh GR III
Amazon.com : Pentax Ricoh GW-3 .75x Wide Conversion Lens GW-3 18-18mm Fixed Lens for Other Cameras : Camera Lenses : Electronics
Amazon.com : GW-4 Wide Conversion Lens for GR III Digital Compact Camera : Electronics
Ricoh GW-4 21mm Wide-Angle Conversion Lens for Ricoh GR III Review
Ricoh GW-4 Wide Angle Lens Review for Ricoh GR III (GA-1 Review) - YouTube
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New RICOH GA-1 Lens Adapter for GW-4 Wide Conversion Lens on GR III | eBay
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