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At the high performance end of their range, Orion had a series of two element apochromatic (apo) refractors manufactured by Synta [8] featuring "extra low dispersion" fluorite crown glass in one element of the objective lens. These are marketed as the ED80 (80 mm or 3-inch (76 mm) objective at f/7.5), ED100 (100mm or 4-inch (100 mm) at f/9) and ...
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.
Summary of Leica M lenses Speed Name 21mm 24mm 28mm 35mm 50mm 75mm ... Leica 80mm f /1.4 Summilux-R; ... Lens APO Telyt R 3.4/180
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 .
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.
The standard lens was the 80mm f/2.8 C or the 80mm f/1.9 C. [5] The M645J was manufactured from 1979 to 1982. This was a stripped-down version of the M645, with the mirror lockup knob and second shutter button removed. The standard lens was the 80mm f/2.8 C or the 80mm f/1.9 C. [2]