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Correction. The black plastic material I use in my scopes is black polypropylene- comes with a nice textured flat black finish. Kydex is another form of black plastic.
Another reason that big dob builders prefer wood is that it dampens vibrations. All metal truss scopes can ring like a bell for ages when they get bumped. Wood is also more forgiving to work with than metal. Starstucture made all aluminium scopes for ages though.
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