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I use 2 homemade nichrome straps - one for the 14" and one for the 4" guidescope. The 14"version is powered by up to 5 amps (in 8 steps) and a dew shield and stops everything but fog while the scope is pointed at or near zenith.
I live in Canberra and my equipment had been frosted over (hard ice) and the SCT corrector has still been clear and the scope still hit and imaged every target.
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