Leica Iiif repair & common faults
Excellent coverageThe Leica IIIf is a screw-mount rangefinder from the early to mid 1950s, the last major update of the classic Barnack-derived body before the M series arrived. It is entirely mechanical, with no meter or battery, and its added flash synchronisation selector is what sets it apart from the earlier IIIc. Reliability now largely comes down to the condition of its cloth shutter curtains and the age of the lubricants inside its speed and delay mechanisms.
Manual mechanical exposure · Horizontal cloth focal-plane shutter, separate fast and slow speed dials · Flash synchronisation selector · No built-in meter · LTM (M39) screw mount
Common Leica Iiif faults
Leica IIIf shutter has pinholes or light leaks
The rubberised silk curtains that make up the shutter dry out and craze with age, and pinholes or hairline splits let light through onto the film, usually as spots or a streak along one edge. It is a fault in the curtain material itself rather than the timing mechanism. Held open to a window with the back off, pinholes show as bright points of light through the cloth.
Leica IIIf slow shutter speeds are sticking or wrong
Below around 1/30 second the IIIf uses a separate slow-speed escapement, and decades-old lubricant inside it thickens, so slow speeds run long, hesitate, or the shutter hangs open on B or 1 second. The fast speeds on the top dial run on a separate train and often stay accurate even once the slow dial has failed. A shutter that visibly stays open on a slow setting points here.
Leica IIIf rangefinder is dim, doubled or misaligned
A rangefinder that looks dim, shows a faint or doubled patch, or focuses noticeably off from the true distance points to ageing in the prism silvering or a shift in the internal mirror alignment, both common on a camera this old regardless of how carefully it was used. Wiping the front and eyepiece glass first is worth doing, since dirt on the outer surfaces can mimic the same symptoms.
Leica IIIf won't wind or shutter won't fire
If the wind knob stops partway or the release feels dead, the fault usually sits in the gear train, a stretched curtain tape, or the shutter's own lockout, which stops a second fire until the wind stroke has fully completed. Check that the wind knob has been turned all the way to its stop before pressing the release, since a half-finished stroke will lock the shutter out on this model.
Leica IIIf self-timer or sync dial is jammed
The delay-action self-timer and the flash sync selector each run on their own small spring, and old grease in either can seize, so the dial won't turn, or a started timer runs down and leaves the shutter jammed shut. Leave the dial alone rather than forcing it if it feels stuck partway, since forcing a seized timer can take the main shutter release down with it.
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