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Optical telescopes can be classified by three primary optical designs (refractor, reflector, or catadioptric), by sub-designs of these types, by how they are constructed, or by the task they perform. They all have their different advantages and disadvantages and they are used in different areas of professional and amateur astronomy .
This is a list of large optical telescopes. For telescopes larger than 3 meters in aperture see List of largest optical reflecting telescopes. This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time.
Aperture First Light Nation Hale Telescope Palomar Obs. 200 inch 508 cm 1949 USA: Hooker Telescope Mount Wilson Obs. 100 inch 254 cm 1917 USA: McDonald Obs. 82 inch i.e. Otto Struve Telescope: 82 inch 208 cm 1939 USA: David Dunlap Observatory: 74 inch 188 cm 1935 Canada: Plaskett telescope Dominion Astrophysical Obs. 72 inch 182 cm 1918 Canada
This list of the largest optical reflecting telescopes with objective diameters of 3.0 metres (120 in) or greater is sorted by aperture, which is a measure of the light-gathering power and resolution of a reflecting telescope. The mirrors themselves can be larger than the aperture, and some telescopes may use aperture synthesis through ...
The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.
The ETX started out as a 90 mm (3-1/2") Maksutov Cassegrain telescope (first produced in 1996) and took advantage of high volume mass production and simplified optical and parts construction to open a new market for a cheap alternative to the very expensive Questar 3-1/2 Maksutov Cassegrain [1] [2] The ETX "line" has been expanded to 105 mm, and 125 mm Maksutov Cassegrains and achromatic ...
Refractor – Aerial telescope: World's largest 1686: Netherlands: 1686 Christiaan Huygens 170 foot refractor: 20 cm: 8" Refractor – Aerial telescope: World's largest 1689: Netherlands: 1686 Christiaan Huygens 210 foot refractor: 19 cm: 7.5" Refractor – Aerial telescope: World's largest 1686: Netherlands: 1686 Hooke's reflector [3] 18 cm: 7"
Comparison of nominal sizes of apertures of the above extremely large telescopes and some notable optical telescopes. An extremely large telescope (ELT) is an astronomical observatory featuring an optical telescope with an aperture for its primary mirror from 20 metres up to 100 metres across, [1] [2] when discussing reflecting telescopes of optical wavelengths including ultraviolet (UV ...