The inside of the observatory remains dry in heavy rain and has survived many episodes of gail force winds. However, there are heavy dews most nights where I live about 10 km from the coast so moisture on the inside surface of the roof is definitely an issue. Basically, I have just learned to live with heavy dews. I run dew heaters on all the optics and leave a plastic bag over the computer before going to bed. The camera body runs warm so no dew forms on its surface. I don't think that any of my equipment has failed due to moisture - yet.
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