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
How Are You At The Factory" as though it was the second single. It reached #16 on Billboard's Album Rock Tracks chart. On his review of "Think Visual", David Wild of "Rolling Stone" wrote, "the melancholy "How Are You" is another of Ray's well-crafted songs of love and loss." The track also appeared on the compilation album, "Picture Book". Like many other Kinks singles of the 1980s, a promotional video for "How Are You" was filmed, featuring Ray Davies. Unusually, the video "How Are You" (as well as those for the two other singles from "Think Visual") was not directed by Julien Temple,