Previous iterations of the targeting system helped shooters increase their chance of hitting their mark by a factor of four, but suffered from short battery life, range finder accuracy errors and overheating problems.

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X-ray and gamma-ray spectrometer, a magnetometer and a laser range-finder, as well as good, old-fashioned digital photography.

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But the rugged IIIf remained the photojournalist's camera of choice during the turbulent post-war years until it was replaced in 1957 by the ultimate range-finder, the Leica IIIg.

ECONOMIST: A die-hard analog photographer goes digital