Although I get where you guys are coming from.... no it is not good to leave a heavier lens with a camera on a tripod attached to the cameras tripod mount... however people seriously underestimate the strength of these cameras. I forgot where the thread was or if it was even a Potn thread, but I saw a story with pictures of a guy that forgot his camera ontop of his car, a rebel with a tamron 17-50 2.8 attached i believe? or maybe one of their superzooms... anyway he didn't remember it and by the time he was going 30 or so the camera fell off, hit the cement, the lens broke... the lenses mount to the body was still on the camera and the body was in fine condition. Those lens mounts can take some stress