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  2. Televue - Wikipedia

    en.wikipedia.org/wiki/Televue

    Recent examples of this telescope have sold for well into 5 figures. Today, Tele Vue's apochromatic refractor telescopes, which have reduced chromatic aberration, come in diameters ranging from 60mm (2.4 inches) to 127mm (5 inches). [1] The imaging system ("is" series) telescopes are designed primarily for astrophotography.

  3. Apochromat - Wikipedia

    en.wikipedia.org/wiki/Apochromat

    An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses. The prefix apo- comes from the Greek preposition ἀπό- , meaning free from or away from.

  4. Triplet lens - Wikipedia

    en.wikipedia.org/wiki/Triplet_lens

    A triplet lens A Steinheil triplet telescope eyepiece. The three lenses may be cemented together, as in the Steinheil triplet (optimized for finite conjugate ratio) or the Hastings triplet (optimized for infinite conjugate ratio). [2] Or a triplet may be designed with three spaced glasses, as in the Cooke triplet. The former has the advantage ...

  5. Celestron Inspire 100AZ telescope review: an easy to use all ...

    www.aol.com/news/celestron-inspire-100az...

    Capable of delivering good views of the moon, planets and deep-sky objects, this refractor telescope comes with a uniquely designed lens cap that doubles as a universal smartphone mount

  6. Astro-Physics - Wikipedia

    en.wikipedia.org/wiki/Astro-Physics,_Inc.

    Astro-Physics, Inc. is a manufacturer of amateur telescopes, mounts, and accessories.Founded in 1975 by former Sundstrand Corporation engineer Roland Christen, [1] the company is noted for its line of apochromatic refractors as well as high-end mounts.

  7. Refracting telescope - Wikipedia

    en.wikipedia.org/wiki/Refracting_telescope

    A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). The refracting telescope design was originally used in spyglasses and astronomical telescopes but is also used for long-focus camera lenses .