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Mine is spending the night outside tonight. It's already pretty damned wet. Optics are clear, I'm going to bed. Will get up again @ 4am to park the scope but everything will stay out there until the morning.
I'm a big fan on the sacrificial card dew shield but if you can find something like 1mm thick plastic sheeting, that's even better. Or the insulating stuff people use for sun protection on their windscreen on their cars. That stuff makes a great long lasting dew shield that also helps catch and eliminate stray light.
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