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Hi Markus.
I'm not sure what effect foil would have on your scope. My guess would be that, if the felt material is thick enough to insulate against the tube temperature, it might not matter what the tube surface is like. If it's not thick enough for thermal insulation, foil would help. It's pretty easy to see tube currents in an out of focus star image, so that might be a starting point. I used low thermal mass thermocouples to measure temperatures around the tube when I was trying to work out what to do and I taped on a reflective emergency blanket to test out the effects of foil before I covered the OTA in the reasonably premanent sticky stuff. regards Ray
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