There's a lot to be said for the capabilities of mirrorless cameras today, with myriad autofocus options and other features at your fingertips. But there's also a lot to be said for simplicity, and it's in this regard that Canon's EOS 6D was the perfect expression of what a camera should be. That may be a hot take, but I'm not alone in that thought. London-based portrait photographer Martin Castein feels very much the same way about his 6D. As someone who worked at Canon during the 6D's heyday,