Ricoh GW-4 Wide Angle Conversion Lens For GR IIIThe Ricoh GW 4 Wide Conversion Lens converts the 28mm focal length on the Ricoh GR III camera to a wider 21mm angle of view (35mm equivalent). It features a 0. 75x magnification and it comes with a lens hood which reduces flare and ghosting. The separately available GA 1 Lens Adapter is required to attach this lens to the GRIII. For Use With Ricoh GR III + GA 1 Lens Adapter