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  2. Cheshire eyepiece - Wikipedia

    en.wikipedia.org/wiki/Cheshire_eyepiece

    A Cheshire eyepiece or Cheshire collimator is a simple tool that helps aligning the optical axes of the mirrors or lenses of a telescope, a process called collimation. It consists of a peephole to be inserted into the focuser in place of the eyepiece. Through a lateral opening, ambient light falls on the brightly painted oblique back of the ...

  3. Newtonian telescope - Wikipedia

    en.wikipedia.org/wiki/Newtonian_telescope

    Newtonian telescope design. A Newtonian telescope is composed of a primary mirror or objective, usually parabolic in shape, and a smaller flat secondary mirror.The primary mirror makes it possible to collect light from the pointed region of the sky, while the secondary mirror redirects the light out of the optical axis at a right angle so it can be viewed with an eyepiece.

  4. Schmidt–Newtonian telescope - Wikipedia

    en.wikipedia.org/wiki/Schmidt–Newtonian_telescope

    Schmidt–Newtonian telescope from Meade. Schmidt–Newtonian telescopes offer images with less coma than Newtonian telescopes of the same focal ratio (usually about half). ). The corrector plate also helps to seal the tube assembly from air currents, and provides mounting point for the diagonal mirror, eliminating the diffraction effects from a "spider" secondary supp

  5. Autocollimator - Wikipedia

    en.wikipedia.org/wiki/Autocollimator

    Visual autocollimators are often used for aligning laser rod ends and checking the face parallelism of optical windows and wedges. Electronic and digital autocollimators are used as angle measurement standards, for monitoring angular movement over long periods of time and for checking angular position repeatability in mechanical systems.

  6. LightBuckets - Wikipedia

    en.wikipedia.org/wiki/LightBuckets

    LightBuckets went through an ownership transition in 2011, [citation needed] resulting in a turn-over in what instruments and sites were available. Before then, LightBuckets instruments included Ritchey-Chrétiens by RC Optical Systems including a 0.61 m (24”) f/8 [4] designated LB-0001 and a 0.37 m (14.5") designated LB-0003 both located at the company's observatory in Rodeo, New Mexico.

  7. Beam expander - Wikipedia

    en.wikipedia.org/wiki/Beam_expander

    A refracting telescope commonly used is the Galilean telescope which can function as a simple beam expander for collimated light. The main advantage of the Galilean design is that it never focuses a collimated beam to a point, so effects associated with high power density such as dielectric breakdown are more avoidable than with focusing ...

  8. Catadioptric system - Wikipedia

    en.wikipedia.org/wiki/Catadioptric_system

    Light path in a meniscus telescope (Maksutov–Cassegrain) Maksutov–Cassegrain telescopes are the most commonly seen design that uses a meniscus corrector, a variant of the Maksutov telescope. It has a silvered "spot" secondary on the corrector, making a long focal length but compact (folded optical path) telescope with a narrow field of view.

  9. Laser guide star - Wikipedia

    en.wikipedia.org/wiki/Laser_guide_star

    Powerful laser guide star system at the Paranal Observatory. The actual laser guide star is the small spot above the apparent end of the laser beam. A laser guide star is an artificial star image created for use in astronomical adaptive optics systems, which are employed in large telescopes in order to correct atmospheric distortion of light (called astronomical seeing).

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