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It's worth noting, I've had setups absolutely dripping wet during an imaging session and never had a drama. I keep the laptop set up inside one of those 30L storage tubs with a towel that drops over the front to stop light spilling out and keep warm in. That keeps the computer and it's transformer dry. I keep all the power inside a plastic tool box. An extension lead runs from the verandah into the box, contained within the box is a 12v 30A power supply that powers the mount, focuser and dew control. There is also a power board in there that feeds power to the camera and the laptop. Everything else is exposed...I found ccds generally stay dry as the body is usually warm.. I've had moisture running down the length of ota's and dripping onto the ground without problems. So long as you can keep your optics dry you are set.
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