The Pentax KX is a 35mm SLR film camera that was introduced by Pentax in 1975. It is the successor to the popular Pentax Spotmatic. It was one of the first Pentax K-mount SLRs. With this new series of cameras, Pentax replaced the screwmount lens type with a bayonet mount system. The KX has a Pentax-made all-mechanical focal plane shutter of rubberized cloth. Since it's mechanical and not electronic, all shutter speeds are still available whether or not the camera has batteries. However, the shutter provides electronic flash sync only up to 1/60 sec. Overall, the Pentax KX is a reliable and versatile camera that is well-suited for both beginner and professional photographers.