Amazon.com : Ricoh Teleconversion Lens GT-2 [Compatible with RICOH GR IIIx] [1.5X teleconversion Lens] [Achieves Focal Length Equivalent to 75mm When cropping 50mm] [Used with Lens Adapter GA-2 (Sold Separately)] : Electronics
Ricoh GR IIIx + GT-2 tele conversion lens sample gallery: Digital Photography Review
Snapshooting in Ginza with GR IIIx and Tele Conversion Lens (KYO) | GR official | RICOH official community site
Ricoh GW-4 Wide Conversion Lens 30248 B&H Photo Video
Ricoh GR Wide Angle Adaptor (GW-3): Out of the Box Impressions – SeattleSteve.me
Ricoh GR III Digital Camera with GW-4 Wide Conversion Lens Kit
Snapshooting in Ginza with GR IIIx and Tele Conversion Lens (KYO) | GR official | RICOH official community site
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 Wide Angle Adaptor (GW-3): Out of the Box Impressions – SeattleSteve.me
Amazon.com : Ricoh Lens Adapter GA-1 for Gr III Digital Compact Camera & Gw-4 21mm Conversion Lens : Electronics