Hi Marc - Prevention is better than a cure. Dew straps are great, make your own, don't buy one unless you are really rich.
The secret however is to also get an old sock (thick ones are best) and cut a hole in the toe area and put that over the lens after you have attached the heater. You will loose less heat from around the lens body and therefore need less heat to keep the dew off.
Call me for more information.
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