Pentax K-x Digital Camera Review

Chromatic Aberration

There wasn't much chromatic aberration at most settings, though a keen eye will note some problems when shooting at the widest zoom..

The K-x offers optional digital processing to control lateral chromatic aberration adjustment.

The K-x delivers nice results at the widest lens setting, with softness and chromatic aberration becoming a bit more noticeable with the aperture stopped down to f/22, but still not bad.

Images shot at the middle aperture setting look crisp, while both extremes show some softness, though little chromatic aberration.

Shooting at the highest zoom setting under bright studio lighting, we again see far superior results in the middle aperture range than at the larger or smaller ends of the spectrum.

Distortion

We don't include distortion results in our scoring for cameras with interchangeable lenses, but we do run the test on the kit lens. In this case, there was virtually no distortion when shooting in the middle of the zoom range, some slight pincushioning at full telephoto and quite a bit of barrel distortion (over 2.5%) at the widest angle 18mm setting (equivalent to 27mm on a 35mm camera).

The K-x has an optional distortion correction system that attempts to digitally manipulate an image to minimize the effect of distortion when shooting with a compatible lens.