At the impressionable age of 14 I saw Easy Rider at my local cinema, and went back the very next night to see it again, the only time I've ever been affected enough by a film to do that.  It was directed by Dennis Hopper, who had been a prolific photographer until then but reportedly never took another photograph after that.  Yesterday I visited the Royal Academy in London to see a collection of more than 400 vintage black and white prints made by Hopper himself for his first major exhibition in 1970.  It was a fascinating journey through one of the most creative periods of his life before he devoted himself completely to cinema.  You have until 19 October to follow me.