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I found when I first got the C11 that I could not view anything for a couple of hours after setting up, at the moment I don't do any imaging. Using the Cat cooler I can get it cooled in less than 30 minutes. This is particularly useful because a lot of my "viewing" is done at public venues, I don't want to have to arrive 2 hours before viewing starts in order to setup and then stand around twiddling my fingers.
They are not cheap, but IMO I think they are worth every cent. A possible extension would be a cooler box to go around the intake with a couple of peltiers in it.
I read somewhere that with a C14, it is quite possible that it will never reach ambient temperature without some sort of thermal assistance...maybe they need to make an SCT with a flip top head to let all the hot air out!
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