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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. At the time, the company specialized in the repair of survey equipment. [4]
Some Leupold hunting sights with duplex reticles allow range estimation to a White-tailed deer buck by adjusting magnification until the area between the backbone and the brisket fits between the crosshairs and the top thick post of the reticle. Once that is done, the range be read from the scale printed on the magnification adjustment ring.
The refractive indices of the oil and of the glass in the first lens element are nearly the same, which means that the refraction of light will be small upon entering the lens (the oil and glass are optically very similar). The correct immersion oil for an objective lens has to be used to ensure that the refractive indices match closely. Use of ...
Lens layouts of earlier Nagler eyepieces Nagler "type 2" (1988) eyepiece lens layout. Invented by Albert Nagler and patented in 1979, the Nagler eyepiece is a design optimized for astronomical telescopes to give an ultra-wide field of view (82°) that has good correction for astigmatism and other aberrations. Introduced in 2007, the Ethos is an ...
The focus of the first lens is traditionally about 2mm away from the plane face coinciding with the sample plane. A pinhole cap can be used to align the optical axis of the condenser with that of the microscope. The Abbe condenser is still the basis for most modern light microscope condenser designs, even though its optical performance is poor.
The reticle consists of a series of chevrons, the topmost being zeroed at 400 meters, with each descending chevron indicating points of aim at 100 meter intervals beyond the main 400 meter zero. Inside the main chevron lies a dot that was implemented to be used against targets that are 500 meters from the operator; the second and third chevrons ...
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In applications of augmented reality, fiducials help resolve several problems of integration between the real world view and the synthetic images that augment it. [2] Fiducials of known pattern and size can serve as real world anchors of location, orientation and scale. They can establish the identity of the scene or objects within the scene.