And yes, I've found myself tending to use the Tv setting on the camera, setting my shutter speed myself and letting the camera choose both the ISO and aperture - especially if I am out shooting moving subjects (people, birds, animals, planes, etc.). That way I'm less worried about exposure and more able to focus on framing and capturing the subject at the right moment. My new 70D really does well with that, with its focusing system and faster frames-per-second. This shot, though, was with the old T2i (it was about 10 degrees outside and I didn't want to expose the new camera to the more extreme conditions). Its buffer fills up after just a couple of shots, so I was fortunate to get one that captured the action. I used a Canon 18-135mm (non-STM) lens. I really like its versatility.