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I know for a fact there is an aussie who has been doing this for ages and never had the OTA dew up. Asimov, was doing this all last year and it worked a treat. In fact I am sure that he had a thread here sometime ago. I know another site that he did the same.
If you are concerned about dew forming then try using the fridge and silica gel in the tube. This will dry the air out inside the tube. Besides if you leave the cap off the back the air will dry out from the fridge.
Active cooling is meeting a lot of resistence from the old school of thought. I come across it all the time, where people ask me about getting dew on objectives. However, the benefits outweigh the costs.
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