6 Tips for Avoiding a Foggy Lens
Briefly

Dealing with a foggy lens can be quite frustrating, especially in tropical environments where humidity is high and condensation forms quickly. Having your camera acclimate to the surroundings before use is crucial to avoiding the fogging issue. Without this preparation, every time you step outside, your lens can fog up, causing missed photo opportunities and potential lens problems.
The best method to avoid lens fog is to let your camera acclimate to its new environment before shooting. This means leaving your camera out in the warm air for a few minutes after bringing it from a colder location. This acclimation period may require patience, as it could take anywhere from a few minutes to half an hour.
Read at Digital Photography School
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