Watch 123Movies. This video artfully weaves together a sort of history of Magnum Photos, one of the world's premier photo agencies, with a fresh look at where new Magnum photographers are taking the group. Magnum is more than a traditional photo agency, though, which is not widely known. It is a cooperative of photographers founded in 1947 whose original members tended to focus on documentary-style photography. This focus has developed over the years to become almost an ethos: to compassionately record the human condition.