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2. Aperture - Wikipedia

   en.wikipedia.org/wiki/Aperture

   In some contexts, especially in photography and astronomy, aperture refers to the opening diameter of the aperture stop through which light can pass. For example, in a telescope, the aperture stop is typically the edges of the objective lens or mirror (or of the mount that holds it). One then speaks of a telescope as having, for example, a 100 ...

3. Telescope - Wikipedia

   en.wikipedia.org/wiki/Telescope

   Aperture synthesis is now also being applied to optical telescopes using optical interferometers (arrays of optical telescopes) and aperture masking interferometry at single reflecting telescopes. Radio telescopes are also used to collect microwave radiation , which has the advantage of being able to pass through the atmosphere and interstellar ...

4. Optical telescope - Wikipedia

   en.wikipedia.org/wiki/Optical_telescope

   The Large Binocular Telescope at the Mount Graham International Observatory in Arizona uses two curved mirrors to gather light. An optical telescope is a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors.

5. Objective (optics) - Wikipedia

   en.wikipedia.org/wiki/Objective_(optics)

   In a telescope the objective is the lens at the front end of a refracting telescope (such as binoculars or telescopic sights) or the image-forming primary mirror of a reflecting or catadioptric telescope. A telescope's light-gathering power and angular resolution are both directly related to the diameter (or "aperture") of its objective lens or ...

6. Diaphragm (optics) - Wikipedia

   en.wikipedia.org/wiki/Diaphragm_(optics)

   The Hamburg Observatory-Bergedorf location had a 60 cm (~23.6 inch) aperture Great Refractor by Reposold and Steinheil (Lenses). [10] One unique feature of the Hamburg Great Refractor is an iris diaphragm that allows the aperture to be adjusted from 5 to 60 cm. [11] This telescope was activated in the early 1910s. [11]

7. f-number - Wikipedia

   en.wikipedia.org/wiki/F-number

   The f-number N is given by: = where f is the focal length, and D is the diameter of the entrance pupil (effective aperture).It is customary to write f-numbers preceded by "f /", which forms a mathematical expression of the entrance pupil's diameter in terms of f and N. [1]

8. Exit pupil - Wikipedia

   en.wikipedia.org/wiki/Exit_pupil

   In optics, the exit pupil is a virtual aperture in an optical system. Only rays which pass through this virtual aperture can exit the system. The exit pupil is the image of the aperture stop in the optics that follow it. In a telescope or compound microscope, this image is the image of the objective element(s) as produced by the eyepiece. The ...

9. The long and storied history of Aperture Science - AOL

   www.aol.com/news/2010-03-25-the-long-and-storied...

   Since the early '50s, Aperture Science has been working hard on some pretty impressive shower curtain technology, perfecting something called the "Heimlich Counter-Maneuver" (designed to interrupt ...