Leica MPAn arctic photographer has chosen a film-based Leica MP camera to record his latest expedition because he says digital cameras are unreliable in extreme conditions.

Explorer Martin Hartley, who has set off on a three-month trek to the North Pole as part of the Catlin Arctic Survey, said: ?At the start of every expedition on the Arctic Ocean in late February/March, it is difficult to survive let alone operate a camera, due to the severe conditions. Below minus 40ºC electronic circuits slow down and become unreliable.?

Martin added: ?The mechanical Leica MP will give me the best chance of capturing those elusive photographs? maybe our last opportunity to do so.?

The Leica MP was first produced in 2003.

The Catlin Arctic Survey aims to capture scientific data relating to the way CO2 affects marine life in the Arctic.