I have an EOS-20D and a couple of IS lenses (17-85 EF-S and 100-400 L IS). The manuals (yes, I actually do read them) say that the newer types of IS can be used with a tripod. I tried taking shots of a full moon over the weekend and noticed that the IS kept moving the lens. I eventually turned it off, and also turned off auto-focus because the lens kept hunting, I guess because the moon was bright white and the sky was black. I also do a lot of wildlife photography with a tripod so should I be using IS with a tripod or turning it off? Thanks!