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
36 Degrees and the early legs of the "Meds" tour. It was also released as a B-side to the "Because I Want You" and "Song to Say Goodbye" singles under the title "36 Degrees 2005". It continues to be performed in various arrangements into 2016. Reviews of the song's performance during Placebo's "MTV Unplugged" concert stated that "‘36 Degrees’ (written by a 19-year-old Stefan and a 21-year-old Brian) becomes softer but it’s no less powerful as you’re drawn further into the lyrics of this song" and "In this setting ["36 Degrees"] becomes unexpectedly lush, underpinned by disarmingly subtle waves of piano and