Telescope with 3 tubes Answered
I wish to make a telescope with a long (1 metre) cardboard tube I got with a potrait I bought a few days ago. I already have 3 smaller tubes - 2 from silver foil rolls (which are very thin in diameter - about an inch), and another from a soldering iron (which goes inside the big tube easily).
Is it possible that I make a telescope using three tubes (one sliding inside the other) and three lenses? If yes, how and what lenses I need to use?