The Leica II is a rangefinder camera introduced by Leica in 1932. They were the first Leica cameras with a built-in rangefinder. Several models were produced over the years, in parallel with the Leica III series from 1933.
The Leica II uses a coupled rangefinder distinct from the viewfinder. The viewfinder is set for a 50mm lens; use of shorter or longer lenses requires installing an alternate viewfinder on the accessory socket.
^Unification of the rangefinder and the viewfinder occurred with the introduction of the Leica M3, allowing quick framing and focusing in a single operation. The M3 viewfinder is also able to display viewlines for 50, 90 and 135mm lenses