Hi Peter, I imagine you'll need potentially two or even 3 heaters. One for the guidescope, one for your main scope, and I believe some cameras can even dew up. You'll need a dew controller unit (often have a cigarette lighter power plug) and there are a range of dew strips depending on circumference. Bintel has the Kendrick range, and heaters for ZWO camera's (note: I've got no idea about camera heaters though). Fox
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