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Department store 50 mm Tasco Specialty Refractor on modified mount (lower left) and a 114mm Sky-Watcher reflector. 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 ]
Optical telescopes can be classified by three primary optical designs (refractor, reflector, or catadioptric), by sub-designs of these types, by how they are constructed, or by the task they perform. They all have their different advantages and disadvantages and they are used in different areas of professional and amateur astronomy .
The Meade Instruments (also shortened to Meade) was an American multinational company headquartered in Watsonville, California, that manufactures, imports, and distributes telescopes, binoculars, spotting scopes, microscopes, CCD cameras, and telescope accessories for the consumer market. [2]
The eVscope is a 114 mm (4.5 in)-diameter Prime focus reflector, focal length 450 mm. It projects its image onto a 4.8 mm × 3.6 mm (0.19 in × 0.14 in) CMOS color sensor with 1.3 million pixels. [2] The image is transmitted to a small screen in an eyepiece also mounted on the telescope.
The ETX started out as a 90 mm (3-1/2") Maksutov Cassegrain telescope (first produced in 1996) and took advantage of high volume mass production and simplified optical and parts construction to open a new market for a cheap alternative to the very expensive Questar 3-1/2 Maksutov Cassegrain [1] [2] The ETX "line" has been expanded to 105 mm, and 125 mm Maksutov Cassegrains and achromatic ...
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