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
Less Than (song) Less Than (song) "Less Than" is a song by American industrial rock band Nine Inch Nails, from their EP "Add Violence". It was released on July 13, 2017 and the music video alludes to the video game "Polybius", an urban legend about a video game used to data mine information from people to the government. On October 2017, it peaked at number 10 on the "Billboard" US Mainstream Rock Songs chart. "Less Than" was announced and released as the lead single and opening track to the "Add Violence" EP on July 13, 2017. The song's music video was released on