Ricoh GXR

The camera unit consists of a lens, image sensor, and image processor encapsulated inside a sealed casing, which prohibits unwanted particles like dust from getting inside. The body is built from magnesium alloy and includes the control scheme with an ergonomic design. This allows users to interchange lens by simply attaching the camera unit to the body unit via a slide-in mount system. Included also on the body are a built-in flash, an accessory port for mounting an optional electronic viewfinder, and even an Auto-Focus assist. 

The beauty of the system is that as better quality lens / image sensors are manufactured, you need only replace the camera unit and can reuse the body for as long as you desire.Very good detail and sharpness at base ISO, Good dynamic range with smooth highlight roll-off, Very good performance in low light, low noise levels and good retention of detail at the same time, Excellent build quality and handling, Compact dimensions.