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Hi Terran,
Sorry to add even more but many people recommend flocking the tube (making it blacker on the inside). I'm sure this would improve contrast dramatically, particularly when you have strong local lighting.
The worst light pollution is that coming from nearby spotlights. If I use my 12" Lightbridge dob without the shroud, it is virtually useless from my backyard. The shroud makes a HUGE difference as I would expect flocking to do for you.
Have fun,
Doug
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