Pin-Cushioning. This is a common geometric lens distortion causing an acquired image to pucker toward the centre of the image, usually found at telephoto focal lengths.
When straight lines bow in from the frame edge it is known as pin-cushioning. This is typically found at the long end of zoom lenses.
Lens fault corrections Edit
Astigmatism Edit ...
 See also: Focal length, Subject, Space, Shape, Stop
  
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