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2. List of telescope parts and construction - Wikipedia

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

   Field lens: A correcting lens placed just before the image plane of a telescope. [citation needed] Telecompressor or focal reducer: Optical element to decrease the telescope's focal length and magnification (usually by a fixed percentage) and widen the field of view, providing opposite effects of a Barlow lens.

3. List of instruments used in ophthalmology - Wikipedia

   en.wikipedia.org/wiki/List_of_instruments_used...

   fine sharp-tipped untoothed forceps for doing a continuous curvilinear incision and removal of the anterior capsule of the lens ("continuous curvilinear capsulorhexis - ccc") •MacPherson's forceps: fine sharp-tipped untoothed forceps with an angulation for holding parts of the lens, the intraocular lens, 10-0 (very fine) sutures, etc.

4. Dragonfly Telephoto Array - Wikipedia

   en.wikipedia.org/wiki/Dragonfly_Telephoto_Array

   [4] [5] [6] The array is designed to accommodate the addition of lenses to increase its effective aperture with each additional lens. [3] With 48 lenses, the instrument has a light gathering power equivalent to a 400 mm f /0.4 lens, or a refracting telescope with an objective lens diameter of 990 mm (39 in). In March 2021 plans were announced ...

5. Edmund Scientific Corporation - Wikipedia

   en.wikipedia.org/wiki/Edmund_Scientific_Corporation

   Edmund Scientific Corporation, based in Barrington, New Jersey, was founded in 1942 as a retailer of surplus optical parts like lenses.It later branched out into complete systems like telescopes and microscopes, and in the 1960s, a wide variety of science toys and kits.

6. 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 ...

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