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2012 has been the year that smartphones have started to dominate the world of still photography. Kodak has fallen apart, the cheap digital camera market is in decline, Facebook has offered $1 billion for Instagram. How would a smartphone camera in the hands of a professional photographer perform during this year's biggest sporting event? Follow Guardian photojournalist Dan Chung as he captures the London 2012 Olympics using smartphonesReading on mobile? Click here