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Edmund designer Norman Sperling and optical engineer Mike Simmons came up with the basic design and Peter Bressler Design Associates did the detailed work on this simple introductory telescope. [ 2 ] [ 3 ] Rather than using a more traditional equatorial or altazimuth mount the Astroscan features a spherical housing around the primary reflector ...
Simmons Optics, a line of rifle scopes, binoculars, and other optical products. [ 25 ] [ 26 ] Under license from EOTech , Bushnell also sells Holosight, a polymer-cased non-magnifying holographic weapon sight that generates an illuminated virtual crosshair that appears to be floating in front of the gun in perfect alignment.
The scope base is the attachment interface on the rifle's receiver, onto which the scope rings or scope mount are fixed. Early telescopic sights almost all have the rings that are fastened directly into tapped screw holes on the receiver, hence having no additional scope base other than the receiver top itself.
Tasco offers several spotting scopes. These scopes are designed for rugged outdoor use and feature rubber armor protection as well as optional camouflage . Models have magnifications between 12 and 45 times, and feature panoramic view finding.
The camera used two lenses to simultaneously expose a wide-angle and a high-resolution image on the same film. The wide-angle, medium resolution mode used an 80 mm F 2.8 Xenotar lens manufactured by Schneider Kreuznach, Germany. The high-resolution mode used a 610 mm F 5.6 Panoramic lens manufactured by the Pacific Optical Company.
Cross-section of a typical retrofocus wide-angle lens. Extreme or ultra-wide-angle lens - a wide-angle lens with an angle of view above 90 degrees. [4] Extreme-wide-angle lenses share the same issues as ordinary wide-angle lenses but the focal length of such lenses may be so short that there is insufficient physical space in front of the film ...
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Also by custom, a lens of focal length 35 mm or less is considered wide-angle. Ultra wide angle lenses have a focal length shorter than the short side of the film or sensor [citation needed]. In 35 mm, an ultra wide-angle lens has a focal length shorter than 24 mm. Common wide-angle lenses for a full-frame 35 mm camera are 35, 28, 24, 21, 20 ...
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