Are all the astronomical telescopes reflecting telescopes?

As someone else said, there are several kinds of optical telescopes for astronomy. The three categories are Refractors, which use lenses to gather and focus light, Reflectors, which use mirrors to do so, and Catadioptrics, which use a combination. read more

For these reasons, all large modern optical telescopes are reflectors. Newtonian Telescope A reflecting telescope in which incoming light is intercepted before it reaches the prime focus and is deflected into an eyepiece at the side of the instrument. read more

Although reflecting telescopes produce other types of optical aberrations, it is a design that allows for very large diameter objectives. Almost all of the major telescopes used in astronomy research are reflectors. read more

All modern research telescopes and large amateur ones are of the reflector type because of its advantages over the refractor telescope. Advantages. Reflector telescopes do not suffer from chromatic aberration because all wavelengths will reflect off the mirror in the same way. read more