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I ca t offer proof the following works but I think it helps exclude street lights at least.
I made what I would call baffled dew tubes for most of my scopes (not the 12 inch).
Its a tube about 2.5 feet with baffles painted black and sprinkled with saw dust and painted over.
If you look at the Hubble Space Telescope you will see they do this...they mention something about a stray light thing.
I have not done any tests to show there is a difference but I think the contrast is better...
Alex
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