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Dew ended my night last night! I couldn't work out what was going on. When the sun came up there was a low layer of heavy fog, then it all made sense. Everything got really wet, primary mirror fogged up. Mine's a solid tube dob as well. I recorded 0.7mm of ... fog. Apart from that it would have been good seeing. Not real hard to take out the primary mirror and clean it, I've done it twice. I make sure it goes back in the same place (marked it with stickers). Then re colimate it.
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