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I really dont have to much of a problem with dew or even frost, believe it or not.
I always have a small 12' fan placed on a tripod so it can be moved in any direction, set it to low and it creates a mild breeze across the front of the lens, and or any telescope.
The fan runs as long as it takes to complete my nights work , never a problem, it dose a great job, and iv'e been doing this for years.
If extremely frosty, i use a old hair dryer on low heat with the same effect.
The air just has to blow across the front of the objective never really hitting the scope, or lens at all.
works every time.
Cheers leon
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