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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I want really cheap...
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I did a tube reuse project, when I was younger & even more stupid than now. July 4th party coming up, so I pack ~10 roman candles into a large thick cardboard tube, covered with foil. Lighting the mass w/a sparkler, I shoot 100+ exploding balls into the air in about 20 seconds.🎆
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Grind your own mirror? Looks like you're aiming at a 3'' f5, it's doable as a cheap project


