Quote Originally Posted by hyperFocal
I do the same, too. Just make sure the camera is not moving too much and not in the wind while changing as the movement of air may bring dust into the F-mount cavity. I think most of the time, dun have to be overly concerned about dust when changing lens, unless you're in a very dusty environment like industrial places. Also make sure the lens' rear end is clean to start with. I'll rather get the shot, than worry too much about dust and missing the moment.

I like to use canned compressed air to blow dust off the CCD. Works well for me.
some forums are saying that canned air contains oil residue of some sort and is not good for the CCD...u might want to take note.