this is a 3 part question, so bare with me.
first, i read from other places on the web that you can remove the rubber piece at the back of the 10-22 and then use it on a 1D series. but question would it work on a 5D2?
secondly, once you remove it, would you still be able to use it on a crop camera like the 30D?
thirdly, if this is both true, could it be done to other lens like the 17-55 on a FF?