After attaining glory, Cartier Bresson abandoned photography for finding it too mechanical. Yet cellphones have turned all of us into amateurs. And very often, as we can see in social media, virtuous ones: it goes on to prove that quality is a function of quantity. Yet it’s true that mechanization has sped things up unnaturally. Hence the rise of long term photo assignments, to document life as it happens in ample spans. Guy Martin in Istanbul and Ciril Jazbec in Greenland are among the “slow” photographers. Photos don’t lie, it is said. They can also say the truth more calmly, frame by frame.