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
38 Degrees above a flat-line membership structure. 38 Degrees also claims its campaigns are selected by its members under its "Campaigns by You". David Babbs is Executive Director. He signs off some emails, appears in the media and frequently speaks at local 38 Degrees events. He has also represented 38 Degrees in front of parliamentary select committees. Babbs describes his motivation for campaigning as coming from "a gut feeling that things could be better, politically, socially, and environmentally and that the reason they’re not is largely due to the conscious actions of powerful people rather than due to bad luck or any