Newtonian Telescopes Common Newtonian telescope These are Newtonians, Cassegrains and Dobsonians. We are going to focus on the 3 types that are in use by amateur and professional astronomers today. There are many types of reflecting telescopes, but a lot of them are no longer used, like Gregorian telescopes. We also have an article on the pros and cons of reflecting telescopes that goes into more detail about their specific advantages. This includes the telescopes used in observatories, and even the Hubble and the James Webb Space Telescope are, in principle, reflecting telescopes. almost every big telescope is a reflector of some kind. To this day, reflecting telescopes are the best design we have to build large telescopes. The design has been perfected throughout the years and multiple types of reflecting telescopes have been innovated, but the basics remain the same.
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