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One more thing... In the later versions of my cooler I made the perspex disk about 2cm oversize all the way around. This has the effect of directing the hot air away from the scope and the cold side. The perspex disk the effectively closes the end of the tube and makes the cooler more efficient.
In the early versions I was having trouble with the hot air off the heatsinks getting back into the tube and playing havok with the scope.
Bird
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