Okay. I think I've finally learned my lesson: Never bring cameras that aren't up to snuff. This one still works fine. But about 10 years ago, Canon chose to save a few pennies by leaving out the felt filter gaskets in between lens barrels. So their cameras now suck in dust. This one has already been on a road trip with us. Even on this particular road. There is no way to remove the dust from between the lenses. Well, it can be done, if you have special tools to re-align the lenses, only available at the factory. It costs more to clean than to replace. The dust is only a problem when shooting toward the light. About half of the time.