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
360 Degrees of Billy Paul 360 Degrees of Billy Paul 360 Degrees of Billy Paul is an album by soul singer Billy Paul. It was produced by Kenny Gamble and Leon Huff and arranged by Bobby Martin, Lenny Pakula and Norman Harris. Released in 1972, it includes the Grammy Award-winning number 1 pop and soul single "Me and Mrs. Jones" and its follow-up "Am I Black Enough for You?" which reached number 29 on the soul chart and number 79 on the pop chart. The album was expanded and remastered by Big Break Records for compact disc in 2012 with three bonus tracks, new liner