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Preventing Dew

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Posted by Peter McGivern on September 8, 2000 22:52:34 UTC

Kept my truss tube newtonian telescope out all night so that I could view Jupiter and Saturn early this AM. Went outside at 3:00 AM and dew was on the mirror and secondary.

Used a hair drier to evaporate the droplets from the secondary, but how do you remove it from the mirror? I didn`t try the hair drier on the mirror because I didn`t want to warm the disk and cause image problems as the mirror cools back down again.

Any suggestions on keeping dew from forming in the first place? I drapped a cloth over the truss tube, but it didn`t help.

Thanks.

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