The Canon FT QL is a 35mm single-lens reflex camera introduced by Canon Inc. in March 1966. It has a Canon FL lens mount compatible with the large range of FL series lenses. The FT can also operate the later Canon FD series lenses in stop-down mode, but the earlier R series has a different lens aperture mechanism and cannot be used, although the bayonet fitting is similar. The standard kit lenses were Canon's 50mm f/1.8 ; 50mm f/1.4 and 58mm f/1.2, the body-only option was offered later. FT QL was introduced in March 1966, a year after the pellicle mirrored Canon Pellix. However it differs from the Pellix models, having a normal quick-return reflex mirror and offering stop-down TTL metering. The TTL metering is semi-spot in nature and works through a prism incorporated in the viewfinder condenser/screen assembly. The later Canon F-1 has a similar prism for metering in its removable screen. The Canon FT viewfinder screen is not user changeable. The pentaprism finder is fixed like the similar FX and FP models but unlike some earlier Canon R reflexes. The cloth focal plane shutter has speeds from 1 sec to 1/1000 and B. The electronic flash sync. speed is 1/60. A delayed action timer gives 8 – 10 seconds delay, using the same front of body lever that actuates the stop-down metering. The mirror can be locked up for vibration reduction or for use with special FL lenses like the original 19mm f3.5 wide angle which projects deeply into the body and would foul the mirror. The QL designation was a reference to Canon's ingenious and successful "quick load" system. A stainless steel sprung hinged device inside the rear door makes film loading simpler than competing cameras of the era. You just laid the film's leader over the drive gear and take-up fingers and closed the back. It also made it "repeatable" - by always putting the same sprocket hole over the drive gear you could rewind a partially-shot roll (leaving its leader out) and put it back in later. You'd just click past the already-taken frames (with the lens cap on) and then continue. This made it possible to switch back and forth between types of film: black and white, color negative, and color slide. An accessory device, the Canon Booster, worked only with the FT QL and Pellix QL. It is a plug-in device that sits