A dew heater on a telrad? Fancy stuff. I put Velcro on both sides of my telrad and made a 5" long arch that extends from each side of the telrad and over the glass element. Made from EVA75 I got from Clark Rubber. Keeps my Telrad completely dry even on the worst dew nights in winter.
In Sydney 3 days ago I was outside with my scope. Singlet and shorts and my telrad glass element had dew on it without the shield. I suspect you're telrad will dew up in Melb pretty often indeed.
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