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
Straight in a Gay Gay World Straight in a Gay Gay World Straight in a Gay Gay World was the third studio album released by Australian '70s rock band, Skyhooks. The album was released on 23 August 1976. With the exception of "Million Dollar Riff", it was recorded at The Record Plant in Sausalito, California, after the band's first tour of the United States earlier in the same year. The title and songs are a sort of view the band had on their experience in the States. Like the band's first two albums, "Living in the 70's" and "Ego Is Not a Dirty Word", "Straight in