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2. Catadioptric system - Wikipedia

   en.wikipedia.org/wiki/Catadioptric_system

   The Houghton telescope or Lurie–Houghton telescope is a design that uses a wide compound positive-negative lens over the entire front aperture to correct spherical aberration of the main mirror. If desired, the two corrector elements can be made with the same type of glass, since the Houghton corrector's chromatic aberration is minimal.

3. The best telescopes for beginners - AOL

   www.aol.com/news/best-telescopes-beginners...

   By Colin Rosemont. For premium support please call: 800-290-4726 more ways to reach us

4. Televue - Wikipedia

   en.wikipedia.org/wiki/Televue

   The introduction of the original Nagler 13mm Type 1 in 1982 with its wide field of view and an equally high price soon made their mark. Using different combinations of lenses of different types of high index optical glasses, the eyepieces produce, respectively, a 50°, 62°, 68°, 72°, 82°, 100°, and 110° apparent field-of-view. Tele Vue ...

5. Night-vision device - Wikipedia

   en.wikipedia.org/wiki/Night-vision_device

   The effect on the natural night vision of the eye is evident A standard telescopic sight augmented with a night-vision device in front on the M110. Note that in addition to the image intensifier, the NVD gathers much more light by its much larger aperture A 1PN51-2 night-vision reticle with markings for range estimation First-person view ...

6. 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.

7. Amateur astronomy - Wikipedia

   en.wikipedia.org/wiki/Amateur_astronomy

   Amateur astronomers watch the night sky during the Perseid meteor shower.. Amateur astronomy is a hobby where participants enjoy observing or imaging celestial objects in the sky using the unaided eye, binoculars, or telescopes.