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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 ED120 (120mm or 4.7-inch (120 mm) at f/7.5). Orion also sold binoculars for astronomical and terrestrial observing, microscopes and monocular spotting scopes of the type used by birdwatchers and marksmen.
The higher the twilight factor, mathematically, the better the resolution of the binoculars when observing under dim light conditions. Mathematically, 7×50 binoculars have exactly the same twilight factor as 70×5 ones, but 70×5 binoculars are useless during twilight and also in well-lit conditions as they would offer only a 0.14 mm exit pupil.
Binoculars: Bushnell sells a wide variety of binoculars and was awarded the Best Buy award from Outdoor Life magazine in 2005 for their Browning Sports Optics binoculars and in 2006 for their Legend binoculars. [22] [23] Microscopes; Telescopes: Bushnell made smaller amateur optical telescopes. Some popular models include the "ARES 5", and the ...
Celestron was the first large scale commercial manufacturer of the Schmidt-Cassegrain telescope, introducing its "C8" 8" diameter 2032 mm focal length, ƒ10 telescope in 1970. [7] The primary innovation Celestron/Tom Johnson devised was a method to produce Schmidt corrector plates using a vacuum to pull the glass blanks into a pre-shaped curve ...
A vintage Osborne Fire Finder produced under the name "Leupold-Volpel & Co.". Leupold & Stevens was founded by the German immigrant Markus Friedrich (Fred) Leupold and his brother-in-law Adam Voelpel in 1907, under the name Leupold & Voelpel.
Magnification power below 5× is usually desired in these circumstances in order to minimize image shake and maintain a large enough field of view. [1] A magnification of 3× is normally recommended. The design of many modern opera glasses of the ornamental variety is based on the popular lorgnettes of the 19th century. Often, modern theatre ...