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  2. Televue - Wikipedia

    en.wikipedia.org/wiki/Televue

    At the North East Astronomy Forum 2010, they revealed the Ethos SX, a 3.7mm focal length eyepiece with an even greater 110° apparent field-of-view. [3] In 2011, a new line of eyepieces was introduced called the Delos. These eyepieces are based on the Ethos but have a smaller field of view of 72°. Instead, they boast a comfortable 20mm eye relief.

  3. Eyepiece - Wikipedia

    en.wikipedia.org/wiki/Eyepiece

    (The eyepiece and the eye together make an image of the image created by the objective, on the retina of the eye.) The amount of magnification depends on the focal length of the eyepiece. An eyepiece consists of several "lens elements" in a housing, with a "barrel" on one end. The barrel is shaped to fit in a special opening of the instrument ...

  4. Reticle - Wikipedia

    en.wikipedia.org/wiki/Reticle

    A reticle, or reticule [1] [2] also known as a graticule, is a pattern of fine lines or markings built into the eyepiece of an optical device such as a telescopic sight, spotting scope, theodolite, optical microscope or the screen of an oscilloscope, to provide measurement references during visual inspections.

  5. Delos - Wikipedia

    en.wikipedia.org/wiki/Delos

    Delos (/ ˈ d iː l ɒ s /; Greek: Δήλος; Attic Greek: Δῆλος, Doric Greek: Δᾶλος), is a small Greek island near Mykonos, close to the centre of the Cyclades archipelago. Though only 3.43 km 2 (1.32 sq mi) in area, it is one of the most important mythological, historical, and archaeological sites in Greece .

  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. Astrophotography - Wikipedia

    en.wikipedia.org/wiki/Astrophotography

    Positive projection – A method in which the telescope eyepiece (eyepiece projection) or a positive lens (placed after the focal plane of the telescope objective) is used to project a much more magnified image directly onto the film or CCD. Since the image is magnified with a narrow field of view this method is generally used for lunar and ...

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  9. Lensmeter - Wikipedia

    en.wikipedia.org/wiki/Lensmeter

    A Lensmeter in an Optical shop A simple lensmeter cross sectional view. 1 – Adjustable eyepiece 2 – Reticle 3 – Objective lens 4 – Keplerian telescope 5 – Lens holder 6 – Unknown lens 7 – Standard lens 8 – Illuminated target 9 – Light source 10 – Collimator 11 – Angle adjustment lever 12 – Power drum (+20 and -20 Diopters)

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