Telescopes {Cassegrain reflector telescope} can use main mirrors to reflect to small mirrors and back through hole in main mirror.
Telescopes {Coudé system} can observe bright objects using objective mirrors that send light to concave mirrors that send light to flat rotatable mirrors and eyepieces, along mounting axis parallel to Earth axis.
Telescopes {reflecting telescope} can observe visible stars using parabolic mirrors as objectives.
Telescopes {refracting telescope} can observe stars using biconvex objective lens.
Telescopes {Schmidt telescope} can be wide-field refracting telescopes with lenses to correct for spherical aberration.
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Date Modified: 2022.0225