I take all my hare shots and action dog shots with 7D's. I could go full frame with the 5D mk2 or 3, BUT, and it's a bit BUT, I'd lose 40% focal length and that is a hell of a big downfall. I had this conversation with someone a few years back. They said that it wouldn't matter as the pic can be cropped and the pixels would take it. So we both went out, took our cameras and took shots of exactly the same runs the dogs had. I think I might have been using a 40D or 50D at that time, but anyway, I got the greater % of shots and the other photographer only had usable pics when the action was very