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Tele Vue once manufactured a 5" refracting telescope named the MPT, the Multi-Purpose Telescope. It had a fast f/4 ratio, and had an adjustable diaphragm that ranged from f/4 to f/20. Only a small number were made, with the last being kept by Televue to use as a final optical quality control for all eyepieces they make.
Tasco's telescopes have a reputation as entry-level equipment. [2] [3] It is one of several companies advertising their products based on claims of high magnification, far beyond any attainable usable magnification. [2] Tasco's telescopes tend to be referred to as "department store telescopes."
See duplex option below. This was first offered for sale in May 1956. A 3.5" Duplex, optically and mechanically identical to the Standard, but which included a simple way of detaching the telescope from the open fork mount to allow the optical tube assembly (OTA) to be used as a 1240 mm at f12 telephoto lens. This variant has been in production ...
The 100-inch (2.5 m) Hooker telescope located at Mount Wilson Observatory, California, was completed in 1917, and was the world's largest telescope until 1949. It is one of the most famous telescopes in observational astronomy of the 20th century.
Star Diagonal: Used to change the angle of the light coming out of a telescope, for easier viewing. Herschel Wedge: Similar to a star diagonal with a wedge-shaped unsilvered prism reflector that reduces incoming light by up to 95% for solar viewing. Coma corrector a correcting lens used to reduce coma distortion in fast reflecting telescopes.
A range of 2.4 to 6-inch (150 mm) refractor telescopes. 6 to 10-inch (250 mm) traditional reflector telescopes on German equatorial mounts. SkyScout – an astronomical sky finder or a personal planetarium. Digital, Biological, and Stereo viewing microscopes; Binoculars and Spotting scopes; Various mounts
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 ...
F137 Telescope, (3-inch) M1912; F138 Mount, Telescope, M1912M1, M1918; F139 Board spotting M2; F140 Quadrant Gunners, M1 (Mils) F141; F142 Mount Telescope, M4; F143; F144; F145; F146 Glass field type-E. 6-power, and glass field type-EE, (Navy) F147 Compass, prismatic, M1918, (Keuffel and Esser type) M4 Collimator Sight, used for both indirect ...
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3579 S High St, Columbus, OH · Directions · (614) 409-0683