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Brett,
agree with the others, forget Rainex, It is great for what it was intended, but that didn't extend to optics.
There is no reason dew control should or needs to cost "hundreds" either.
There are a few articles in the archives or maybe the Projects pages, detailing DIY dew systems. Ultimately though, there is no getting around the fact that you will need some form of dew control, I do, and it is just a fact of life.
Gary
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