turbulence in the atmosphere. Limits a telescope's abilities. Can be magnified by a telescope
Size matters as far as light gathering ability goes. Sometimes a greater magnification just causes problems, though. And a larger scope can't necessarily magnify more. That is only controlled by eyepiece?
Color distortion. This applies to lenses only. Distortion in a lens when the focal lengths don't match up and the separate colors become visible.
The Refractor Telescope
bends light. Uses a lens as the main light gatherer
The Reflector Telescope
Reflects light. Uses a mirror as the main light gatherer.
Reflector telescope. Can tell because the eyepiece is positioned on the side. Flat mirror to reflect into eyepiece.
Reflector telescope. Uses a spherical mirror at the back and a flat mirror in the center (or flat for a Maksutov). Light bounces into the back then into the mirror in the center, then into the eyepiece.
The Catadioptic Telescope
Combo of the refractor and reflector. Also called a cat telescope. Uses a lens and a mirror as the main light gatherer.
Twin refractors (one for each eye).
German Equatorial Mount
Points towards Polaris for reference. T-shaped. Uses weights for balance.
All world class telescopes use this. Can take a heavier and bigger telescope.
Eliminates atmospheric turbulence. Newer telescopes use this feature. Developed during the cold war. Uses lasers making fake stars to measure turbulence and correct for it.