Yet again I find myself with nice thick cardboard tubes. These are 16 3/8 x 3 (from packing film rolls). This time I must use them in a project. I’m thinking telescope. Where can I find 3” lens or mirror? I’m thinking I’ll make a refractor, a reflector, and a third thing
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Might have to nix the telescope project... the lenses/mirrors are way too expensive to buy for a carboard-tube reuse project
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