Ultra wide angle lens the difference is only whether distortion is present or not. However, the shorter the focal length, the more difficult it is to implement rectilinear correction. In fisheye lenses, the visual angle is close to or more than 180 degrees in at least one direction. For example, a "diagonal fish eye" would have a viewing angle of at least 180 degrees within the diagonals of the frame. A "circular fisheye" would represent the image in the form of a circle. Rectilinear ultra-wide angle lenses are used in photography and cinematography sometimes to achieve three-dimensional perspective distortion instead of simply two-dimensional barrel
While(1 Is Less Than 2) While(1 Is Less Than 2) While(1<2) (stylized as while(1<2); pronounced "while one is less than two") is the seventh studio album by Canadian electronic music producer Deadmau5, released on June 17, 2014 by Mau5trap, Virgin EMI and Astralwerks, his only album to be released by the latter. The album is a departure from the bass-heavy, upbeat template of his previous work, instead foraying in a more experimental direction, with tones of downtempo and ambient music. Many of the songs on the album were originally uploaded to Deadmau5's SoundCloud account before they were removed from the site in early 2014. The