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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.
Focuser: Allows the user to adjust the focus by moving the eyepiece along the optical axis. Eyepiece : Performs the final focus correction before the light reaches the eye. Charge-coupled device (CCD) : A light-sensitive integrated circuit digital sensor (commonly used in digital cameras) that turns light into an electrical charge used to ...
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
In optics, a relay lens is a lens or a group of lenses that receives the image from the objective lens and relays it to the eyepiece. Relay lenses are found in refracting telescopes , endoscopes , and periscopes to optically manipulate the light path , extend the length of the whole optical system , and usually serve the purpose of inverting ...
One of the most important properties of microscope objectives is their magnification.The magnification typically ranges from 4× to 100×. It is combined with the magnification of the eyepiece to determine the overall magnification of the microscope; a 4× objective with a 10× eyepiece produces an image that is 40 times the size of the object.
A wide-angle process lens with 4 elements in 4 groups, optimized for reproduction ratios between 2:1 and 1:2. The 270 mm lens has an angle of coverage of 72°, the 240 mm has 80°, and the 210 mm has 86°, which give these lenses gigantic image circles, though the image softens considerably near the edges of coverage.
In addition, one of the two eyepieces can be further adjusted to compensate for differences between the viewer's eyes (usually by rotating the eyepiece in its mount). Because the focal change effected by the adjustable eyepiece can be measured in the customary unit of refractive power, the dioptre , the adjustable eyepiece itself is often ...