Leica's 1967 M-series rangefinder with rapid film loading, angled rewind, and framelines for 35, 50, 90, and 135mm — the standard chrome M4.
The Leica M4 (1967–1975) is a significant evolution in the Leica M-series rangefinder cameras, introducing the angled film-loading spool that simplified rapid film loading — eliminating the cumbersome process required by earlier M2/M3 bodies. It also added 35mm and 135mm framelines to the 0.72x viewfinder alongside the existing 50/90mm lines.
35mm film rangefinder, Leica M-mount, 0.72x viewfinder with 35/50/90/135mm framelines, angled rapid-load film spool, mechanical shutter (1–1/1000s + Bulb), no light meter (motor drive coupling prepared), self-timer.
The M4 is often considered the most 'usable' of the classic chrome M cameras — its rapid-load spool simplifies field reloading over the M2/M3 mechanism, while the 0.72x magnification suits eyeglass wearers and the four-frameline set covers the most practical focal length range. No built-in meter: uses separate clip-on meters (Leicameter MR, Leicameter MC) or incident meters. All current Leica M-mount lenses are compatible.
Test rapid-load spool function (the defining practical improvement of the M4). Check rangefinder alignment at close and infinity focus. Inspect viewfinder/rangefinder window for haze. Test shutter at all speeds including 1/1000s. Check self-timer operation. Inspect film door seals.