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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 ...
The Meade "ETX" series Maksutov-Cassegrain telescope (105mm aperture). Meade produces a line of Maksutov telescopes under their ETX series (Everybody's Telescope). They were first produced in 90 mm (3-1/2") Maksutov Cassegrain telescope in 1996. They range in size from 90 mm to 125 mm.
A 70 mm film strip with a human hand for scale. 70 mm film (or 65 mm film) is a wide high-resolution film gauge for motion picture photography, with a negative area nearly 3.5 times as large as the standard 35 mm motion picture film format. [1] As used in cameras, the film is 65 mm (2.6 in) wide.
Vivitar 90mm ƒ/2.5 Macro (1:1 macro, made by Komine) Vivitar 90mm ƒ/2.8 Macro (1:1 macro, made by Komine) Vivitar Series 1 90mm ƒ/2.5 1:2 Macro, 1:1 achieved with dedicated extender, nicknamed the Bokina (made by Tokina) Vivitar 100mm ƒ/2.8 Macro (made by Kiron) Vivitar Series 1 105mm ƒ/2.5 macro (1:1 macro, made by Kiron)
Maksutov's 1944 design was the first-published meniscus telescope design, and was published in the widely-read Journal of the Optical Society of America. [11] [12] [7] This led to professional and amateur designers almost immediately experimenting with variations, including Newtonian, Cassegrain, and wide-field camera designs.
Ultimately, a valid comparison between two telescopes must take into consideration more specifications, when a general measurement becomes obtuse. Aperture of the primary mirror alone can be poor measure of a reflective telescope's significance; for example, the Hubble Space Telescope has only a 2.4 metres (94 in) primary mirror. In addition ...
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