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A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. [ 1 ] [ 2 ] In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle.
Schematic of a conventional and a periscope zoom lens Xiaomi Mi 10 Ultra with a 5x optical zoom periscope lens camera, recognizable by the rectangular shape of its lens. A periscope lens, sometimes called a folded lens, is a mechanical assembly of lens elements that uses a prism or mirror to redirect the light through the lenses with a 90° angle to the optical axis, as in a periscope.
Periscope was an American live video streaming app for Android and iOS developed by Kayvon Beykpour and Joe Bernstein and acquired by Twitter, Inc. before its launch in March 2015. The service was discontinued on 31 March 2021 due to declining usage, product realignment, and high maintenance costs.
Facebook introduced a video streaming service, Facebook Watch to select individuals in August 2017, and to the public in January 2018. [5] [6] Facebook watch is a video-on-demand service that allows users to share content live. It allows people to upload videos that cover a wide array of topics including original comedy, drama, and news ...
Bigo Live is a global social live streaming platform owned by BIGO Technology based in Singapore, [1] [2] which was founded in 2014 by David Li and Jason Hu. As of 2019, Bigo Technology is owned by JOYY.
A collection of telephoto lenses. A telephoto lens, also known as telelens, is a specific type of a long-focus lens used in photography and cinematography, in which the physical length of the lens is shorter than the focal length.
Virtual periscope is a system that allows submerged submarines to observe the surface above them without having to come to a shallower depth, as is required by traditional periscopes. The system, described in a patent as "Virtual Periscope", [1] was tested in 2005 aboard USS Chicago (SSN-721). It employed a small camera mounted on the sail of ...
Vimeo had established the Festival and Awards to help give video and filmmakers an opportunity to highlight their work on Vimeo's pages and gain potential work from clients. [78] [79] [80] In 2008, Vimeo launched its Staff Picks, highlighting videos in a special channel as picked by the company's employees as some of the best work by its users ...