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F42 Mount, telescope, M2 (for 75mm mortar carriage, M1); Telescope, elbow, M3 (for 75mm mortar carriage, M1) – Parts and equipment F43 Sight, M1912, 2.95-inch mountain gun – Parts and equipment F44 Altimeter, M1917, M1920.
Many of these eyepieces that come with such telescopes are plastic, and some even have plastic lenses. High-end telescope eyepieces with this barrel size are no longer manufactured, but you can still purchase Kellner types. 1.25 inch (31.75 mm) – This is the most popular telescope eyepiece barrel diameter. The practical upper limit on focal ...
These diagonals (often called star diagonals) use a mirror set at a 45° angle inside the diagonal to turn the telescope's image at a 90° angle to the rear cell. Mirror diagonals produce an image in the eyepiece that is correctly oriented vertically, but is reversed left-to-right horizontally. This causes image reversal, the view in the ...
Primary lens: The objective of a refracting telescope. Primary mirror: The objective of a reflecting telescope. Corrector plate: A full aperture negative lens placed before a primary mirror designed to correct the optical aberrations of the mirror. Schmidt corrector plate: An aspheric-shaped corrector plate used in the Schmidt telescope.
Questar was founded in 1950 by Lawrence Braymer, who set up Questar to develop and market Maksutov telescopes and other optical devices for the consumer, industrial, and government customers. The Questar Standard telescope has been in production since 1954.
A fully electronic, motorized alt-az mount telescope the Unistellar eVscope 2 is as beautiful as it is functional with instant access to the cosmos. Unistellar eVscope 2 telescope review Skip to ...
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