Pentax 16701 K-x Black K-x Manual - Page 194
Lens Correction, Distortion, Lateral chromatic aberration
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192 You can also change the setting from the [A Rec. Mode 2] menu (p.79). Lens Correction 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. 6 Shooting Settings 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.