There are also several modern words used in conjunction with these types of telescopes. Dob or Dobsonian. SCT or Schmidt-Cassegrain Telescope. Telescope and Astronomy Definition section. Quality refractors will generally never need alignment and usually produce fine images .
Reflector telescopes use a concave mirror at the bottom of a tube to focus the light.
The Mt. Palomar 200 inch mirror telescope is a Newtonian reflector. This classification is a more modern implementation of telescope. These scopes combine lenses and mirrors to make a very versatile, compact telescope. For equivalent aperture, this type of scope is more expensive than a reflector. This page is still under construction, please pardon the dust.