Hi Chuck, Bruce Grim has an open tube scope and I think he has mentioned his primary frosting up. Bruce doesn't hang out here on U-A so I'm CCing a copy of this message to him so maybe he can reply. Patrick On 22 Dec 2006, at 21:31, Chuck Hards wrote:
Do any of you large Newtonian users employ a secondary heater for anti-dew/frost use?
I've never used or needed any kind of optic heaters; a conventional tube acts as a really long dew-cap. I was wondering if dew or frost is a problem with open-frame, truss-tube Newtonians?
Oops, I have used a small chemical hand-warmer rubber-banded to the eyepiece, but that's it. Prevents fogging in cold weather, and brain freeze.
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