This is really the problem Is it really water getting in ie leakage or is it condensation. good lenses are supposed to be sealed units. A little bit of condensation that goes away quickly like when you take it from a cold car to a humid environment can happen. But if the original poster is talking about outside water getting in than that may not clear on its own (think terrarium) in the worst case it could mean a service call to clear up salt or similar deposits from the inside of the glass. Or a multi week drying out cycle (happened to a friend in Thailand).I used to carry a small hair dryer and set it on cool for fogging in the lens. Depending on how bad it it that may be a quick fix. Was in a snowstorm once where water got into the lens and that took the engineering department and a few days.