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 At 16 I was working with Charlie Parker. He's one of the giants. Coming from a jazz background it was one of the greatest things to happen for any singer because of the fact I took an interest at heart but learned to build on it. When I say that I just didn't want to be labeled as a jazz singer but like my new album, the one that "Me & Mrs. Jones" is on, it's called "360 Degrees of Billy Paul" and that means I'm covering all of the territories." In its November 25, 1972, issue, "Billboard" wrote: "Billy