Lens Correction - Pentax K-30 Operating Manual

Lens Correction

Reduces distortions and lateral chromatic aberrations occurring due to
lens properties.
Distortion
Distortion is a phenomenon in which the center of the image appears
inflated (barrel distortion) or the center of the image appears pinched
(pincushion distortion). Distortion occurs more easily when using a
zoom lens or a small diameter lens, and straight walls or the horizon in
an image appear curved.
Pincushion distortion
Lateral chromatic aberration
Lateral chromatic aberration is a phenomenon in which the
magnification of an image varies according to the colors (wavelengths
of light) when a picture was taken, and may cause a blurred image.
Chromatic aberration occurs more easily at shorter focal lengths.
Barrel distortion
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