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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.
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Notable examples, both Ottonian, are the Pericopes of Henry II and the Salzburg Pericopes. Lectionaries are normally made up of pericopes containing the Epistle and Gospel readings for the liturgical year .
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Periscope: English United States: Service ran from March 2015 to March 2021. Pixorial: English United States: Service ran from 2009 to July 2014. Acquired by LifeLogger Technologies Corp. in 2016. Revver: English United States: Service ran from October 2005 to 2011. Acquired by LiveUniverse in 2008. Sevenload: 12 languages Germany
Schematic of a conventional and a periscope zoom lens A smartphone 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.
Xiaomi Mi 11 Ultra with periscope telephoto lens (rectangular opening below the two lenses). This is a list of smartphones with a telephoto lens that offers a focal length (35mm equivalent) of at least 100mm or "4× optical zoom" with an imaging area equivalent to a 1/3.5″ or larger sensor.
The translated view can also be described by a translation of the observer in opposite direction. For example, with a vertical periscope, the shift of the world is away from the observer and down, both by the length of the periscope, but it is more practical to consider the equivalent shift of the observer: up, and backward.