A lens distortion in which straight lines near the edges of the frame bend inward, toward the center. The corners of the image look stretched outward, like the shape of a pincushion. It is common with telephoto lenses and at the long end of zoom lenses. The opposite effect is barrel distortion.
Pincushion distortion can be corrected in software such as Lightroom or Photoshop, often automatically with lens profiles. Many cameras also correct it in JPEG files.
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