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And watch for secondary fogging, on newts in those conditions it can be a problem. There are secondary heaters available from places like Kendricks. Kendricks is from Canada and they know cold management. They might have a solution for heating your focuser. I know they sell a rubber sheet type heater that can be used on the back of mirrors, and these can be cut I believe, (they have a heater core), I used their RC secondary heater for a couple of years before I sold the scope.
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