Daniel, you are obviously not familiar with Bryan Greer's work on this subject. (Incidentally, Bryan is the owner of Protostar). Alan Adler validated his findings and published his working systems- on a Bill Kelley-style flexed mirror telescope, come to think of it. He doesn't cool the mirror, he breaks-up the boundary layer of slow-moving, warm air immediately in front of it. The effect is striking. You flip on the fan, blowing over a warm mirror, and the image snaps into near perfection- instantly. His ground-breaking work has been all but forgotten by amateurs. They still think in terms of "cooling" the mirror. Their loss. On 5/16/10, daniel turner <outwest112@yahoo.com> wrote:
Chuck:
My experience with large mirrors is that waiting an hour works better than a fan. I just spend the time walking around talking to others and looking through their telescopes.