The evolution is having profound and unforeseen effects on society -- from changing the way that people record their daily lives to making it harder to trust the images we see.
His business -- fittingly called Just Film -- used to have 12 employees. "I refer to myself as a buggy whip salesman or a blacksmith," said von Glasenapp, resigned to the digital photography revolution that has changed his world.
Of course, digital photography has changed just about everybody's world.
He told the Guardian newspaper: “This was by no means my first experience of homophobia.
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But 12 months on, ahead of the annual event this Saturday, Mr Adlem said the tirade of abuse he received on social media after the public proposal led him to regret it.