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Orthoscopic eyepiece diagram. The 4-element orthoscopic eyepiece consists of a plano-convex singlet eye lens and a cemented convex-convex triplet field lens achromatic field lens. This gives the eyepiece a nearly perfect image quality and good eye relief, but a narrow apparent field of view — about 40°–45°.
Abbe in 1880 [1] designed an orthoscopic eyepiece for stereoscopic microscopes which minimized distortion. The term was also used in stereoscopy by Heine [2] [3] for the condition when the perceived depth in a stereogram is the same as that in the actual view of the scene.
Heinrich Erfle (April 1, 1884, Dürkheim – April 8, 1923, Jena) was a German optician who spent most of his career at Carl Zeiss.In 1917 he invented the first wide-field eyepieces for telescopes and binoculars.
Kolorimeter Leitz Wetzlar Trinovid 8×20 C binoculars expanded [1] Leitz compound monocular microscope. Germany. 1922. Perea-Borobio Collection. Carl Kellner, mechanic and self-taught mathematician, published his treatise Das orthoskopische Ocular, eine neu erfundene achromatische Linsencombination (The orthoscopic ocular, a newly invented achromatic lens combination) in 1849, describing a new ...
This list covers optical lens designs grouped by tasks or overall type. The field of optical lens designing has many variables including the function the lens or group of lenses have to perform, the limits of optical glass because of the index of refraction and dispersion properties, and design constraints including realistic lens element center and edge thicknesses, minimum and maximum air ...
Democrats are licking their wounds after Vice President Harris’s defeat to President-elect Trump, but already are looking toward who might lead their party in a 2028 presidential contest.
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