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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. 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.

  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. 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.

  7. List of largest optical refracting telescopes - Wikipedia

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

    The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.