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Find the optimal distance for a given screen. Example: for a 4K UHD screen 140 cm high (112 inches diagonal), the optimal distance is 140 × 1.6 = 224 cm. Find the right screen size. Example: for a 1080 HDTV used at a distance of 250 cm, you need to find a screen whose height is close to 250 / 3.2 = 78 cm (63 inches diagonally).
Qingdao Number 2 Radio Factory, [15] the predecessor of Hisense Group, was established in September 1969. [6] [ Bell 2] The first product of the small factory was a radio sold under the brand name Red Lantern, but the company later gained the know-how to make TVs through a trial-production of black and white televisions ordered by the Shandong National Defense Office. [16]
In display technology parlance, viewing angle is the angle at which a display can be viewed with an acceptable visual performance. In a technical context, the angular range is called viewing cone defined by a multitude of viewing directions.
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The size of a screen is usually described by the length of its diagonal, which is the distance between opposite corners, typically measured in inches. It is also sometimes called the physical image size to distinguish it from the "logical image size," which describes a screen's display resolution and is measured in pixels .
Leitz Elmarit R19/2.8 ultra wide angle lens for Leica R cameras Ihagee Exa camera with Carl Zeiss Jena Flektogon 1:4 20 mm super wide angle lens. An ultra wide-angle lens is a lens whose focal length is shorter than that of an average wide-angle lens, providing an even wider view. The term denotes a different range of lenses, relative to the ...
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