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
Silk Degrees "hit the R&B charts in a big way with the addictive, sly "Lowdown" [...] and expressed his love of smooth soul music almost as well on the appealing "What Can I Say."" However, Henderson stated that "Scaggs was essentially a pop/rocker, and in that area he has a considerable amount of fun." He concluded: "Though not remarkable, the ballads have more heart than most of the bland material dominating that format." On February 27, 2007, "Silk Degrees" was reissued by Legacy Records with three bonus tracks recorded live at the Greek Theatre on August 15, 1976. Silk Degrees Silk Degrees