Open bogadisa opened 3 weeks ago
https://en.wikipedia.org/wiki/Refracting_telescope#:~:text=A%20refracting%20telescope%20(also%20called,for%20long%2Dfocus%20camera%20lenses.
https://en.wikipedia.org/wiki/Refracting_telescope#:~:text=A%20refracting%20telescope%20(also%20called,for%20long%2Dfocus%20camera%20lenses.