I am in Colac and the only things that doesn't fog up is the primary on my 12". Finder, Telrad, eyepieces and secondary all get fog.
I have found that investing in a basic dew heating system is a fantastic investment. I have straps on everyting including the secondary.
If that is not possible, keep the eyepieces capped when not in use, keep a cap on the eyepiece of your finder, a stubby holder with the bottom taken out and held in place with an elastic band protects the objective of your finder. Also keep eyepieces in a box when not in use. A hairdryer can be used to remove dew, just don't get it too close to the glass of eyepeices.
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