Ricoh A12 50mm f/2.5 Macro GR Lens with APS-C 12.3 MP CMOS Sensor Camera unit uses a 23.6 x 15.7mm APS-C CMOS sensor; approximately 12.3-megapixel resolution Features a 50 mm F2.5 macro lens; achieves strong imaging power all the way to the edge of the frame 8-group, 9-element configuration (aspherical lens: 1 element, two surfaces); low level of vignetting allows rich and genuine bokeh effects Manual focus ring for use in macro photography makes highly-precise focusing possible Compatible with the Ricoh GXR interchangeable unit camera system