The Canon Pellix, first marketed in 1965, is a unique manual focus SLR. It was Canon's first 35mm focal-plane shutter SLR camera with TTL metering. But what made it special was its fixed Pellicle mirror. A super-thin, semi-transparent film only .02 mm thick was used as a fixed mirror, rather than the moving SLR reflex mirror. The mirror allows 2/3 of the light to go through to the film, and 1/3 to be transmitted upwards to the viewfinder. Since there was no mirror blackout, the user could see the image at the moment of exposure.