single-lens reflex (SLR) camera: camera back
film cartridge chamber 
Compartment that holds a film cartridge.
film guide roller 
Rotating cylinder that directs the film from the cartridge toward the film guide rails.
film guide rail 
Each of the flat metal rails on both sides of the focal plane shutter; the taut film travels along them.
film leader indicator 
Indicator showing whether the film leader (end of the film extending outside the cartridge) is properly inserted into the take-up spool.
pressure plate 
Spring plate that keeps the film flat as it passes behind the lens.
film sprocket 
Small serrated wheel that guides the film toward the take-up spool.
neckstrap eyelet 
Small ring that holds a strap to help carry the camera.
take-up spool 
Cylinder for winding the exposed film.
focal plane shutter 
Opaque device that opens for a predetermined length of time based on the shutter speed chosen; it allows light to come in contact with the film.
viewfinder 
Device for viewing the scene to be photographed, framing it and adjusting its clarity.
film rewind system 
Manual or motorized device that winds a partially or totally exposed film back into its cartridge.