I have the Telegizmos 365 covers (the picture in the field was at the Tammin deep sky site setup next to Brendan, dribbly light rain, which the covers are totally impervious to.) and have left my scope out from time to time even over winter (Back garden pic with C9.25 setup and polar aligned, waiting for breaks in the weather). They are fantastic. But I agree on the layers suggestion and there should be towels or a blanket lurking underneath to head off any stray moisture. All really fragile electronics should be disconnected and reconnected when ready for use.
all the best
Paul
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