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  2. List of largest optical refracting telescopes - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_optical...

    110 cm (43") total diameter 98 cm (39") clear aperture 15 m: 2002: Single element non-achromatic objective [3] combined with reflective Adaptive optics and a Schupmann corrector. The lens is 110 cm in diameter stopped down to 98 cm (39"). Yerkes Observatory [4] Williams Bay, Wisconsin, USA-102 cm (40") 19.4 m (62 ft) 1897: Largest in current ...

  3. List of largest optical reflecting telescopes - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_optical...

    605 cm f/4 M1 mirror: Mirror replaced twice: 2070 1948–1976: Hale (200 inch) 5.1 – 508 cm f/3.3 M1 mirror: Art deco dome: 1713 1917–1948: Hooker (100 inch) 2.54 – Also used for 1st optical interferometer: 1742 For earlier entries, see List of largest optical telescopes historically

  4. Extremely large telescope - Wikipedia

    en.wikipedia.org/wiki/Extremely_large_telescope

    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 ...

  5. Optical Mechanics, Inc. - Wikipedia

    en.wikipedia.org/wiki/Optical_Mechanics,_Inc.

    OMI mirrors are used by other telescope makers such as Obsession Telescopes. [1] Also taking on custom projects, they produced the 48-inch Dob, a 48.875-inch-diameter (1,241.4 mm) aperture, f / 4, Dobsonian telescope called "Barbarella" and featured in Astronomy Technology Today magazine (June 2008 Issue). [2] [3] OMI is located in the US state ...

  6. Thirty Meter Telescope - Wikipedia

    en.wikipedia.org/wiki/Thirty_Meter_Telescope

    A 3.1-metre (10 ft) secondary mirror is to produce an unobstructed field-of-view of 20 arcminutes in diameter with a focal ratio of 15. A 3.5-by-2.5-meter (11.5 ft × 8.2 ft) flat tertiary mirror is to direct the light path to science instruments mounted on large Nasmyth platforms. [57] [58] The telescope is to have an alt-azimuth mount. [59]

  7. File:Comparison optical telescope primary mirrors.svg

    en.wikipedia.org/wiki/File:Comparison_optical...

    16) Large Binocular Telescope, 11.8 m effective (two 8.4‑m telescopes on a common mount), 2005 and 2006; each individual telescope has the largest monolithic (i.e. non-segmented) mirror in an optical telescope, while the combined effective light collecting area is the largest for any optical telescope in non-interferometric mode

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