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1989 aerial view. Pituffik Space Base (/ b iː d uː ˈ f iː k / bee-doo-FEEK; [2] Greenlandic:; IATA: THU, ICAO: BGTL), formerly and perhaps better known as Thule Air Base (/ ˈ t uː l iː /), is a United States Space Force base located on the northwest coast of Greenland in the Kingdom of Denmark under a defense agreement between Denmark and the United States.
In 1951 the United States was given permission to build Thule Air Base at the site of the settlement. Between 1952 and May 1953, all residents of Pituffik and nearby Dundas (Uummannaq) were forcibly relocated 130 km (81 mi) north to the new town of Qaanaaq, commonly known at the time as "New Qaanaaq" or "New Thule", [3] [4] where people were forced to live in tents from May 1953 until November ...
The T-mount is a standard lens mount for cameras and other optical assemblies. The usual T-mount is a screw mount using a male 42×0.75 (42 mm diameter, 0.75 mm thread pitch) metric thread on the lens with a flange focal distance of 55 mm and a mating female 42mm thread on a camera adapter or other optical component.
This lens adapter is a passive adapter designed for mounting a Nikon F-mount lens to a Micro Four Thirds camera. Active lens adapter: Canon EF to Sony E. In photography and videography , a lens adapter is a device that enables the use of camera and lens combinations from otherwise incompatible systems.
The Earles fork is a variety of leading link fork where the pivot point is behind the front wheel, which is the basis of the Earles' patent. [3] Patented by Englishman Ernest Earles in 1953, the design is constructed of light tubing, with conventional 'shock absorbers' mounted near the front axle.
This mount is an alternative to the altazimuth mount that has the advantage of not having a blind spot near the zenith, and for objects near the celestial equator the field rotation is minimized. [7] It has the disadvantage of having all the mass, complexity, and engineering problems of its equatorial counterpart, so is only used in specialty ...
A large German equatorial mount on the Forststernwarte Jena 50cm Cassegrain reflector telescope. An equatorial mount is a mount for instruments that compensates for Earth's rotation by having one rotational axis, called polar axis, parallel to the Earth's axis of rotation. [1] [2] This type of mount is used for astronomical telescopes and cameras.
As an example, Minolta offered the PC terminal adapter PCT-100 for this purpose, which worked as a galvanic isolator and could withstand 400 volts DC or AC. The similar Sony flash sync terminal and ISO hotshoe adapters FA-ST1AM and FA-HS1AM also offer galvanic isolation as well, but only up to 60 volts DC or AC.