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I just have two 4 inch dew zappers at objective end of Vicky,at the end of the night,I just roll the roof back on the observatory and point the objective towards the carpeted floor and throw a sheet over her.I put dessicant bags on the inside of the cap,also take out the flip mirror a shove a bag up in tube.
Interesting point re hair driers and very cold scopes,I am unsure if anyone has broken a objective on this forum by using a hair drier-but it could be possible-I know the word in the bush re cast iron camp oven is -never put cold water in a hot oven,as it could crack-someone we know put a cast iron pot that had been in oven, on a cold stainless steel bench and it broke (guess they had no tea),but it might be the same for the above cold objective and hot drier.I know astronomers talk about it.
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