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{{Short description|Optical lens that transmits images}} ...ting system.png|thumb|right|Image-erecting optical system for astronomical telescopes (erecting eyepiece)]] ...

{{Short description|Optical system that produces no net convergence or divergence of the beam}} ...e.com/books?id=Jg1JW4kWD1UC&dq=afocal++without+focus&pg=PA38|page=38|title=Optical Imaging and Aberrations: Ray geometrical optics|first=Virendra N.|last=Maha ...

...ertures much larger than <math>r_0</math> (thus including all professional telescopes) will be limited by the turbulent atmosphere, preventing the instruments fr ...ite book| last=Hardy|first=John W.| title=Adaptive optics for astronomical telescopes| year=1998|publisher=[[Oxford University Press]]| url=https://openlibrary.o ...

{{Short description|Type of lens used in binoculars and astronomic telescopes}} ...arovski]] EL 8.5 x 42, EL 10 x 42.}} and in astronomic [[Optical telescope|telescopes]] to improve edge sharpness. ...

...ght|350px|An afocal setup with a digital camera and a [[finderscope]] with optical diagram:<br/> ...ce]] of another image forming system such as an [[optical telescope]] or [[optical microscope]], with the camera lens taking the place of the [[human eye]].<r ...

...focuser, replacing the original [[rack and pinion focuser]] of the [[Orion Telescopes & Binoculars|Orion]] hit XT 10 [[dobsonian telescope]].]] [[Category:Optical devices]] ...

...thods are also used to eliminate the effects of [[astronomical seeing]] in optical and infrared observations using [[astronomical interferometer]]s. [[Image:Recording data at each of the telescopes in a VLBI array.gif|thumb|400px|Three radio telescope receivers.]] ...

...telescopes have only one receiver at the focus of the telescope, but radio-telescopes are now starting to be equipped with focal plane arrays, which are of three where F is the focal length of the optical system, D is the diameter of the optical system and λ is the wavelength. ...

...of optical telescopes where a beam angle implied by the [[Altazimuth mount|optical axis]] of the telescope is ''undone'' to keep its orientation aligned with ...Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes |doi=10.1117/12.2069579|year=2014|volume=9280 |pages=92800C }} ...

...lities with the shire, such as a small [[mobile network]], or the use of [[optical fibre]].<ref name=abc112020/> ==Telescopes== ...

..., so named because they are smaller than the [[angular resolution]] of the telescopes. Some point sources detected by EGRET and ''Fermi'' were at the same locati ...st unidentified gamma-ray sources. His search uncovered [[visible spectrum|optical]] and [[X-ray]] emission at the same location as 2FGL J1317.7–3429 that cha ...

{{Short description|Optical illusion}} ...with optical instruments used visually, in particular [[binoculars]] or [[telescopes]]. If such an instrument is [[rectilinear lens|rectilinear]], or free of re ...

The idea of fluid-optical devices can be traced back at least as far as the 18th century, when spinni ...dex.php |title=COST Action MP1205 Advances in Optofluidics: Integration of Optical Control and Photonics with Microfluidics<!-- Bot generated title --> |acces ...

...0240223"/> Applying the shift-and-add technique to very large [[aperture]] telescopes like Subaru enabled Sheppard's team to probe deeper than previous Neptunian ...-aperture telescopes around the world, which included the 6.5-m [[Magellan Telescopes|Magellan–Baade Telescope]] at [[Las Campanas Observatory]], the 8.2-m [[Ver ...

{{Cite journal |author=F. W. High |display-authors=etal |date=2010 |title=Optical Redshift and Richness Estimates for Galaxy Clusters Selected with the Sunya ...escope|Spitzer]], [[Chandra X-ray Observatory|Chandra]], and other optical telescopes have allowed for identification and redshift measurements of cluster member ...

...Pieter Hendrik van Cittert]] and [[Frits Zernike]],<ref>{{cite book |title=Optical Coherence and Quantum Optics |author1=Leonard Mandel |author2=Emil Wolf |ed ...ched multilayer resonators under partial coherent excitation via multimode optical fibers |author=Mahmoud A Selim, Yasser M Sabry, Frédéric Marty, Tarik Bouro ...

...dergoes about a magnitude of extinction, so that the optical depth ~ 1. An optical depth of 1 corresponds to a mean free path, which is the distance, on avera ...270K| issue=6110| s2cid= 4316409|display-authors=etal}}</ref> measured the optical polarization of the Sun at sensitivity of <math>3 \times 10^{-7}</math>; th ...

...> and as of mid-October 2011 was not visible even using large ground-based telescopes.<ref name="Remanzacco2"/> ...t cloud remnants of Comet Elenin started to become visible to ground-based telescopes around 21 October 2011.<ref name="Remanzacco3">{{cite web ...

...e is made exclusively with [[refraction|light-refracting]] [[lens (optics)|optical lenses]] and does not use [[reflecting telescope|mirrors]] or [[Fresnel zon ...ervatory]] in [[Treptow]], the Bamberg-Refraktor is still one of the large telescopes in the Berlin area. It is the oldest functioning large telescope with lense ...

...its]] of equal width and equally spaced along an axis perpendicular to the optical axis. In this case, <math>M</math> is the number of slits. which [[telescoping series|telescopes]] down to the result. ...