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The Tele Vue range includes Plossl, Nagler, and zoom eyepieces. [2] They started with a variety of Plossl eyepieces for amateur astronomers. The introduction of the original Nagler 13mm Type 1 in 1982 with its wide field of view and an equally high price soon made their mark.
Accessories produced by Meade include the series 5000 eyepieces that are comparable in construction to those of Chester, New York-based Tele Vue Optical's "Nagler" (82-degree field of view), "Panoptic" (68-degree field of view), and "Radian" (60-degree field of view) eyepieces.
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 ...
For example, a 10 × 42 binocular has a 4.2 mm wide exit cone, and fairly comfortable for general use, whereas doubling the magnification with a zoom feature to 20 × results in a much more critical 2.1 mm exit cone. Optics showing eye relief and exit pupil 1 Real image 2 Field diaphragm 3 Eye relief 4 Exit pupil
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(Reuters) -Grubhub settled with the U.S. Federal Trade Commission and Illinois Attorney General Kwame Raoul on Tuesday for allegedly misleading customers about order fees, adding restaurants to ...
A man is igniting viral conversation after sharing that he wants to plan a trip with his longtime female friend — and doesn't want his wife tagging along.
A telescopic sight can have several manual adjustment controls in the form of control knobs or coaxial rings. Diopter adjustment (also called the ocular focus) on the eyepiece — meant to obtain a sharp picture of the target object and reticle. Elevation control – meant to adjust (or "track") the vertical deviation of the optical axis ...