Noun
barrel distortion (uncountable)
In graphic arts, the effect whereby an image bulges outwards at the sides.
Synonym: barreling
Coordinate term: pincushion distortion
The Phase One Schneider Kreuznach 80mm LS f/2.8 lens is capable of capturing extremely detailed images, but shows some barrel distortion. Source: Internet
The CapsuleCam delivered sharp, colorful 1080p daytime video in testing, but as is the case with most wide-angle cameras, barrel distortion was evident. Source: Internet
The wide angle has been reduced to a 107-degree field-of-view from previous generations, but this has eliminated barrel distortion on the edges of photos. Source: Internet