This is a Ricoh KR-10x body that has standard Pentax K bayonet mount so it accepts the new or used PKa/r lenses. This is not a program body so it will accept any K-mount lens. This body has both aperture priority auto exposure (you choose aperture, camera determines proper shutter speed), and fully metered manual control. A handy AE lock helps you deal with complicated lighting conditions. Full information viewfinder includes shutter scale and aperture direct reading (you don't have to move your eye away from the finder). Accepts winder. Has small hand grip. Uses LR44/SR44 batteries.