NiSi Wide Conversion Lens for Ricoh GR Series (GR III, GR IIIx, GRIV)0. 78x Wide Conversion Widens the field of view to deliver a 21mm equivalent focal length on GR III and GR IV, and a 31mm equivalent on GR IIIx, expanding creative framing possibilities for street, landscape, and architectural photography. Compatible with All GR Series Cameras Designed to work with the Ricoh GR III, GR IIIx, and GR IV when paired with the appropriate NiSi 49mm Filter Adapter for each model (sold separately). Macro Mode Compatible