1.25 inch OD aluminum tubing (standard 0.066 inch wall thickness) was used for trusses. I cut them first 140 cm long, then shortened them to 128 cm after mirror was finished and tested in aa assembled optical tube. Trusses were wrapped in pipe insulation foam.
I have made light shroud from black Ripstop nylon.
Back to 20 inch scope
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© Jan Wisniewski