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In 1914 optical engineer Oskar Barnack was working for Ernst Leitz when he designed the very first Leica, the Leitz Camera, or so-called Ur-Leica. The small handheld camera, one of the first to use 35mm film, finally went into production in 1925 following a long delay caused by World War One. It went on to revolutionise photography in the hands of the first photojournalists who set out to record the world on the brink of change.

Today the German company produces a range of digital and film based cameras and a new purpose built factory at Leitz Park in Wetzlar, the town where the Leica was born, is being inaugurated.

Here photojournalist Tom Stoddart, who works with a Leica camera, shares his thoughts on a number of classic photographs as well as the background behind his own favourite image.

Interview conducted by Stephen Evans. Photofilm by Phil Coomes.

Photographs courtesy Tom Stoddart/Reportage by Getty Images with additional pictures from Associated Press, Alfred Eisenstaedt, Yevgeni Khaldei, Leica Camera, Jeff Mermelstein, Rex Features and from Magnum Photos: Robert Capa, Henri Cartier-Bresson, Elliott Erwitt, Thomas Hoepker, Josef Koudelka and Marc Riboud.

Music by KPM Music.