Always have a nice sized tarp on hand and a couple of wheelie bin sized garbage bags. The tarp is the short quick fix but I have bagged and tagged the gear to protect before tarping for a longer duration event. Failing that if it is set in or maybe a storm I have physically moved the scope and mount before to cover. A few years ago at astrofest a dark cloud cam over wit ha quick shower, it stopped the auto guiding but only lasted 5 minutes - tarp off and was still on same star for guiding so resumed activities quickly.
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