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Dark tube.
I dont know if this works but the idea is to eliminate stray light from getting down to the lens.
Think of it as a dew tube with baffles I was concerned about stray light and this was what I came up with.
After I built my first one I noticed that the Hubble Space telescope employs a similar idea... but I think if nothing else it helps cut out light from the street light opposite my spot in Sydney.
I used cardboard and paper towels for the build and some glue was just flour salt and water but when dry I painted that with resin which turns the paper towel into a very strong medium.
Alex
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