Kevin Galka:
I work for Telescopes Canada and we've had similar issues crop up with the Esprit (and other scopes). Sky Watcher told us that the Esprit is only rated to 0°C because of the very issue you're running into. You can't change the physical properties of the glass... maybe they can use more exotic glass but you'd be paying 10x the price (if not even more).

I find it amazing that someone would sell a scope into the US or Europe market that is only rated to 0 C.
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