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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 ...
In 2007, Obsession Telescopes released a second series of telescopes more portable than their original design. They designated this series as Ultra Compact (UC), referring to their former one as 'Classic.' From 2009-2012 their telescopes ranged from USD 3000 for a 12.5 inch telescope, up to USD 12–15,000 for a 25-inch telescope.
Madina Mall; Dubai Mall (Biggest Mall as New South China Mall) Mall of the Emirates (Al Barsha 1) Mirdif City Centre; Mercato Shopping Mall; Dubai Festival City; Arabian Centre; Dubai Marina Mall; BurJuman Mall; Dubai Outlet Mall; Deira City Center; City Center Me'aisem; Cityland Mall; Galleria Mall (Jumeirah) [30] Galleria Mall (Al Barsha) [31 ...
The main material used early on for reflecting telescope mirrors was speculum metal, which reflected only about two-thirds of the incident light, and which tarnished, requiring maintenance. Two-element refracting telescopes were extensively used in 19th century observatories despite their smaller apertures than metal, and later glass, mirror ...
Hooker Telescope Mount Wilson Obs. 100 inch 254 cm 1917 USA: McDonald Obs. 82 inch i.e. Otto Struve Telescope: 82 inch 208 cm 1939 USA: David Dunlap Observatory: 74 inch 188 cm 1935 Canada: Plaskett telescope Dominion Astrophysical Obs. 72 inch 182 cm 1918 Canada: 69-inch Perkins Telescope [10] Perkins Observatory: 69 inch 175 cm: 1931–1964 USA
28-inch Refractor (1893) Thompson Telescope with a 26-inch refractor and 30-inch reflector on one mounting (1896) Lassell 2-foot Reflector (1845) Isaac Roberts 20-inch reflector (1885) Western Equatorial (c.1824) 13-inch Astrographic Refractor (1890) Merz 12.8-inch Visual Refractor (1859-1893) (this was replaced by the 28 inch Grubb in the ...
In addition, many large or significant telescopes are not optical and/or reflecting. However, many famous optical telescopes have had large apertures on their primary mirror with corresponding good angular resolution. The list Includes optical observatories, including UV, visible and some optical infrared telescopes, and near infrared. The list ...
Dubai Mall (originally known as The Dubai Mall, until 2023) (Arabic: دبي مول "Dubai Mall") is the largest shopping mall in Dubai.It is the second largest mall in the world by total land area after the Iran Mall, and the 26th-largest shopping mall in the world by gross leasable area, with a total retail floor area of 350,000 m 2 (3,800,000 sq ft).
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