How much more slowly does a 2" thick, 12.5" primary cool down when compared to a 1.6" version? Assume passive cooldown, well-ventilated mirror box, cooldown from, say, 40 degrees to 10 degrees. A lot longer? A little bit? I'm used to waiting maybe 45 minutes to an hour for a 12.5" 1.6" thick mirror to cool to the point where the images start getting good. I know that a rear-mounted fan would accelerate things...
Thanks,
Doug
Thanks,
Doug