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for the last 2 weeks, i have been thinking that "why not seal the mirror base completely during cooling???"
Ie, instead of trying to fit peltiers and a cold plate to the bottom, simply give it a lid with peltiers and fans recirculating cold air. When it is near ambient / slightly below ambient, then take off the lid and use the scope. Lets make it as much like a fridge as possible. you do not leave the fridge door open and expect it still work as well!!!
You would just need a bigger version of what i am getting made up. ie a perpsex lid (not base) with the aluminium cold plate underneath, blowing air down, (not up like mine)
I have tried gel ice packs held in place by rubber bands, but it was not really satisfactory. Without the moisture drying action of the peltiers and movement action of the fans, the mirror dewed up after a while.
I believe that cold air circulating the mirror is the best / most even method for the mirror.
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