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2. Afocal system - Wikipedia

   en.wikipedia.org/wiki/Afocal_system

   The magnification of such a telescope is given by M = f 2 f 1 , {\displaystyle M={\frac {f_{2}}{f_{1}}},} Afocal systems are used in laser optics, for instance as beam expanders , Infrared and forward looking infrared systems, camera zoom lenses and telescopic lens attachments such as teleside converters , [ 3 ] and photography setups combining ...

3. List of telescope parts and construction - Wikipedia

   en.wikipedia.org/wiki/List_of_telescope_parts...

   Primary lens: The objective of a refracting telescope. Primary mirror: The objective of a reflecting telescope. Corrector plate: A full aperture negative lens placed before a primary mirror designed to correct the optical aberrations of the mirror. Schmidt corrector plate: An aspheric-shaped corrector plate used in the Schmidt telescope.

4. Alvan Clark & Sons - Wikipedia

   en.wikipedia.org/wiki/Alvan_Clark_&_Sons

   Alvan Clark & Sons made the 36-inch (910 mm) objective lens for the Lick Observatory refractor, shown here in an 1889 drawing. The telescope was designed and built by the Warner & Swasey Company Alvan Clark & Sons was an American maker of optics that became famous for crafting lenses for some of the largest refracting telescopes of the 19th and ...

5. Afocal photography - Wikipedia

   en.wikipedia.org/wiki/Afocal_photography

   Afocal photography works with any system that can produce a virtual image of parallel light, for example telescopes and microscopes. Afocal photographic setups work because the imaging device's eyepiece produces collimated light and with the camera's lens focused at infinity, creating an afocal system with no net convergence or divergence in the light path between the two devices. [2]

6. Refracting telescope - Wikipedia

   en.wikipedia.org/wiki/Refracting_telescope

   A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). The refracting telescope design was originally used in spyglasses and astronomical telescopes but is also used for long-focus camera lenses .

7. Alvan Clark - Wikipedia

   en.wikipedia.org/wiki/Alvan_Clark

   Using glass blanks made by Chance Brothers of Birmingham, England, and Feil-Mantois of Paris, France, his firm Alvan Clark & Sons ground lenses for refracting telescopes. Their lenses included the largest in the world at the time: the 18.5-inch (47 cm) at Dearborn Observatory at the Old University of Chicago (the lens originally intended for ...