JA I like your pre-cooler suggestion, and I think I still have a 60W TEC here somewhere, from my DSLR cold-finger days. Heaps of 12V power in the observatory to run the pre-cooler. I would need to find some small ducting. It occurs to me that the PC liquid cooling system that I sold early this year would have been great for a pre-cooler build, given that it had it's own mini radiator. Cumbersome for sure, but if wall mounted and ducted toward the camera it could work to.
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