The P10 28-300mm F3.5-5.6 VC is a lens unit that slides into Ricoh's GXR body. The GXR system takes a novel approach by offering interchangeable slide mount 'lens units' - sealed modules containing both optics and sensor, meaning it can switch from a large (APS-C) sensor with a fast prime lens to a tiny one with zoom lenses (such as the P10). The Ricoh GXR/P10 28-300mm combines a 10MP back-illuminated CMOS sensor with a 28-300mm lens, turning the GXR into a 'Travel Zoom' compact camera.