Pentax K-X Operating Manual page 82

_i_ _ YOU can als0 Change the setting from the [1_ Recl Mode 2] me nu (P,79).
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Reduces distortions and lateral chromatic aberrations occurring due to
lens properties.
• Distortion
Distortion is the 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 lens with a small aperture, and straight walls or the
horizon in the image appear curved.
Pincushion distortion
Barrel distortion
• Lateral chromatic aberration
Lateral chromatic aberration is the phenomenon in which the
magnification of the 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.