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List of telescope types
Astronomical telescopes are divided into subgroups. All telescopes work by collecting electromagnetic radiation and focussing it into an image which may be seen or photographed. The purpose is to see things which are far away in the universe.
The traditional types all work to collect visible light from the sky. Recent types may work outside the visible spectrum. They all have their different advantages and disadvantages and they are used in different areas of astronomy.
- Achromatic: uses convex and concave lenses together, to correct for chromatic aberration.
- Apochromatic: a more complex arrangement, for even less chromatic aberration.
Catoptrics. Optical systems using mirrors: uses reflected light to form the image.
Combined Lens-Mirror Systems
Catadioptric telescopes use corrector lenses to fix problems in a reflector.
Outside the optical spectrum
- See also: Electromagnetic spectrum