Pentax K-5 II User Manual (en)

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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 small diameter lens, and straight walls or the horizon in 
the image appear curved.
 
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. 
Lateral chromatic aberration occurs more easily at shorter focal lengths.
Lens Correction
Pincushion distortion
Barrel distortion