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
2.0 (98 Degrees album) 2.0 (98 Degrees album) 2.0 is the fifth studio album by American boy band 98 Degrees. The album was released on May 7, 2013 through eOne Music. It is their first studio album in thirteen years following "Revelation" (2000), The album was released by eOne Music, making it their first released through an independent record label rather than a major label like Motown or Universal Records. "2.0" debuted at number 65 on the "Billboard" 200, and number 12 on the Independent Album chart becoming the group's lowest-charting album since their 1997 debut album, "98 Degrees", which debuted at number 145.