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Re the desiccant chamber idea I'm part way through my IR and Coldfinger mod and have thought about going back to the cold box idea but filling it with argon instead. Or Silica gel packs to dry the air.
Using a T-Ring and an Ha filter or plain glass on the front effectively gives you a sealed system and OK, have to work out a system for the finger to get outside the box but it's one way to get below zero and nice turn into a popsicle.
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