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Well done trevor. It's good to see more people having a go at this sort of ATM gear.
Closing off the tube is good for a couple of reasons - it stops (or slows) air movement through the tube which gives steadier images, and also lest the cooling do its thing more efficiently.
Peltiers are especially nice, as they follow a constant delta from the ambient temperature - ie if the air drops a few degrees suddenly then the cold side will follow.
cheers, Bird
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