Telescopes

thumb|The 100-inch (2.54 m) Hooker reflecting telescope at [[Mount Wilson Observatory near Los Angeles, used by Edwin Hubble to measure galaxy redshifts and discover the general expansion of the universe.]]

thumb|right|250px|A collection of different types of eyepieces.

Technique used to improve performance of optical systems by compensating for distortions

telescope which is used to focus light from the visible part of the electromagnetic spectrum

camera lens with a variable focal length

Japanese telescope and observatory

thumb|150px|A , f/5.3 astrograph at Lowell Observatory (a refractor with a 3 element [[Cooke triplet lens) used in the discovery of Pluto.]] thumb|150px|A double astrograph consisting of two astrographs and a central guide scope on display at Landessternwarte Heidelberg-Königstuhl observatory. thumb|The Bruce double astrograph at the Landessternwarte Heidelberg-Königstuhl observatory. thumbnail|This is a modern amateur Newtonian telescope|Newtonian astrograph, specifically designed for astrophotography.

two-axis mount for supporting and rotating an instrument such as a telescope about two perpendicular axes – one vertical and the other horizontal

first use of a new instrument to take an astronomical image after it has been constructed

Astronomical instrument for timing of the passage of stars

shaping technology for reflecting telescopes

mounting system for camera or telescope

future observatory in the United States

telescope at Palomar Observatory in California, US

network of 6 small automated telescopes, aiming to find and explore extrasolar planets and variable stars, maintained by the Harvard-Smithsonian Center for Astrophysics

long-term variability sky survey

aspect of history

automated telescope searching exoplanets currently under construction

telescope with mirror made of a reflective liquid

ground-based robotic search for exoplanets

optical system with resolution performance at the instrument's theoretical limit

Dioptrics is the branch of optics dealing with refraction, especially by lenses. In contrast, the branch dealing with mirrors is known as catoptrics. Telescopes that create their image with an objective that is a convex lens (refractors) are said to be "dioptric" telescopes.

type of telescope mount and related software

mechanical structure which supports a telescope

radio telescope located in Greenland

instrument for conducting a spectrographic survey of distant galaxies

telescope focusing device

early telescope

evacuated-optics solar telescope located at the Teide Observatory on Tenerife in the Canary Islands

optical test for curved mirrors

astronomical telescope on the summit of Haleakala in Maui, Hawaii

secondary deflecting or focusing mirror in a reflecting telescope

corrective lens used in Schmidt and Schmidt–Cassegrain telescopes

Astronomy device

nonprofit organization and astronomical observatory

Telescope

method of orienting telescopes and other celestial observation devices

astronomy device for a telescope

network of six solar helioseismology observatories

The Hexapod-Telescope (HPT) was a Ritchey-Chrétien optical telescope, that operated in 2006-2017 in the Cerro Armazones Observatory (OCA) in northern Chile, and is currently decommissioned.