Pincushioning
An effect which occurs with telephoto zoom, in which straight lines at the edges curve in toward the far corners.
Pixel ...
For example, optical imperfections within a lens may cause distortions such as barrel distortion or pincushioning.
With the exception of what looks like an aberrant result in the lower left corner of this image, taken at 14mm (where barrel distortion turns into heavy, but very localized pincushioning) Lightroom 3's lens correction profile does an excellent job of ...
 See also: Data, Lens, Media, Light, Wide-angle
  
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