Ricoh GXR Mount A12 12 MP Digital SLR Camera This Lens Mount Unit allows the Ricoh GXR digital camera to use lenses not originally made for it Universal mount handling Leica M lenses and more 12.3 Megapixels, CMOS 23.6x15.7mm, 1/4000 high speed shutter (1/8000 when electronic shutter is used)