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The Leica M3 was a revolutionary design. It had a combined rangefinder and viewfinder, with parallax corrected frames that matched the focal length of the mounted lens automatically. The viewfinder was the brightest ever made. The M3 was the first camera with an advance lever, instead of a knob. It had a rear door that swings up, to make film loading easier. It featured a new and patented bayonet mount.
Leica M3 (overview, 1954-1966)
