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I have found that an old Kendrick 1.25 inch or 2 inch eyepiece dew strap works okay on 50mm and 60mm finders.
Unless it is extremely heavy dew, you don't need to run these at full power. In SE Qld I have found that the objective lens temp only needs to be a degree or so above the environmental temp to prevent dew forming.
Cheers
Dennis
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