[Utah-astronomy] Secondary heaters

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. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com