The Ricoh GR Lens A12 28mm f/2.5 Camera Unit 4 is designed specifically for use with the Ricoh GXR System. Camera Unit 4 is a completely enclosed camera and lens that slips into the GXR body for full functionality. The body provides the LCD screen, ports, and controls. Together they result in a system that provides dust-free digital shooting.
That being said, Camera Unit 4 is more than a lens. As the name implies, it's the camera. In addition to the 28mm lens, the unit embodies the sensor, the processing engine, and pretty much all the internal workings of a digital camera. The body gives the unit power and a way to maneuver through menus and operate the controls.
Features of the unit, aside from the fixed focus 28mm lens, include multiple metering modes, numerous capture functions, and even an HD movie mode. So, along with being an innovative option in the world of digital photography, the unit is a simple, yet evolved image making machine. A manual focus ring puts more creativity at your fingertips as well. And features like noise reduction, TTL flash (using an auxiliary flash), and the option to add a cable release give you even more tools to stretch your vision with.