Leica M4 [SEP] manufacturer
Leica M4
The Leica M4 is a 35 mm rangefinder camera produced by Ernst Leitz GmbH.
Leica M4.
The M4 started production in November 1966, as the direct successor of the M3 and M2, featuring framelines for 35 mm, 50 mm, 90 mm and 135 mm lenses in a 0.72 magnification viewfinder. It has the frame counter of the M3, with automatic reset after reloading.
Three ergonomic modifications were introduced in the M4: 
- a different, angled film advance lever,
as well as slightly different rewind, self-timer and frame selection levers
- a crank for rewinding the film, that replaced the telescopic knob of the M3
- a faster loading system that does not need a removable spool
Production of the Leica M4 ceased in 1975.
An olive coloured Leica M4, originally designed for the German Army, sold at auction in 2009 for €87,600.
Leica MDa.
A scientific version without a viewfinder was made as Leica MDa (similar to the Leica M1)