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Two scientists from the University of Surrey are on a mission to help us make the most out of our digital cameras.

These devices, with their automated and computerised components, represent the technical pinnacle of photography's 200-year history - and newer, cheaper technology arrives every year.

"But it's still remarkably easy to take a bad picture," says Dr Radu Sporea.

Speaking at the British Science Festival, he and his colleague Dr Andrew Pye are keen to explain some of the principles that give top-notch photos that touch of class.