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  2. Magnifying glass - Wikipedia

    en.wikipedia.org/wiki/Magnifying_glass

    Magnifying glasses typically have low magnifying power: 2×–6×, with the lower-power types being much more common. At higher magnifications, the image quality of a simple magnifying glass becomes poor due to optical aberrations, particularly spherical aberration. When more magnification or a better image is required, other types of hand ...

  3. Coddington magnifier - Wikipedia

    en.wikipedia.org/wiki/Coddington_magnifier

    A Coddington magnifier is a magnifying glass consisting of a single very thick lens with a central deep groove diaphragm at the equator, thus limiting the rays to those close to the axis, which minimizes spherical aberration. This allows for greater magnification than a conventional magnifying glass, typically 10× up to 20×. Most single lens ...

  4. List of largest optical telescopes historically - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_optical...

    glass mirror reflector – Schmidt camera: World's largest Schmidt camera 1948: Palomar Observatory, California, USA: 1948 George Ritchey 40-inch (1 m) [6] 102 cm: 40" glass mirror reflector: First large Ritchey-Chrétien: Flagstaff, Arizona, USA (Washington, D.C. until 1955) 1934 Plaskett telescope [7] 1.83 m: 72" glass mirror reflector

  5. Objective (optics) - Wikipedia

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

    One of the most important properties of microscope objectives is their magnification.The magnification typically ranges from 4× to 100×. It is combined with the magnification of the eyepiece to determine the overall magnification of the microscope; a 4× objective with a 10× eyepiece produces an image that is 40 times the size of the object.

  6. Binoculars - Wikipedia

    en.wikipedia.org/wiki/Binoculars

    Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most binoculars are sized to be held using both hands, although sizes vary widely from opera glasses to large pedestal-mounted military ...

  7. Loupe - Wikipedia

    en.wikipedia.org/wiki/Loupe

    A photographic loupe for examining film and prints. A loupe (/ ˈ l uː p / LOOP) is a simple, small magnification device used to see small details more closely. [1] They generally have higher magnification than a magnifying glass, and are designed to be held or worn close to the eye.

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