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fisheye lens

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noun Photography.
  1. a hemispherical plano-convex lens for photographing in a full 180° in all directions in front of the camera, creating a circular image having an increasing amount of distortion from the center to the periphery.

Origin of fisheye lens

First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for fisheye lens

fisheye lens

noun
  1. photog a lens of small focal length, having a highly curved protruding front element, that covers an angle of view of almost 180°. It yields a circular image having considerable linear distortion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012