Quote:
Originally Posted by Satchmo
I'm sure that a totally open conical primary would obviate the need for active cooling , even a fan for that matter.
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hmmm, for high mag planetary, I would say no for any areas that can experience sudden temp changes (canberra and tasmania being two definate spots)
the mirror would still need to be encouraged to stay within that +/- .5 degree band for proper high mag imaging.
Birds is the most efficient of the lot and I am sure that his system would keep up with the most crazy of temp drops (or increase due to cloud cover), but generally, the less efficient systems will have to wait for the temp to stabilize and then cool to .5 degrees under ambient