How to turn a 400mm lens into a one finger operation. And previously unshown, Canon A590 P&S that lives in my briefcase. Uses AAs so no chargers cables etc required. It's a failsafe camera that has always has charge. It has full manual mode and is fun to play with when you are bored on the road. Like taking long exposure shots of the information screen showing all the canceled flights. There's a 400mm Canon lurking in the background and that is a 50D box, but they ain't mine..