We can also have a Refractor Telescope with a High Quality Single Objective PCX lens, with 120mm and 4000mm focal length. If the tube is long, we can use two flat mirrors to reduce the size. (We all should know ), but a lens working in R G B mode, is allowed this lens: have this diameter of 120mm and 4000mm focal length.
Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you.