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 realizes that he has to leave, as he's "gotta thousand little things I better do. Ah, but it was really good to talk to you. Be on my way, I'm bound to see you on the street again someday, and when I do I'll say How are you?" The reuniting theme of "How Are You" is also apparent in its follow-up single, "Lost and Found". "How Are You", like most Kinks tracks, is sung by Ray Davies. The track also, like many others on "Think Visual", makes use of synthesizers. "How Are You" was first released in November 1986 on