Longitudinal chromatic aberration
From The Glossary of Digital Photography
One of the two types of chromatic aberration found in lenses. The other type is lateral chromatic aberration. The color fringing of longitudinal chromatic aberration is generally found equally on all sides of an object and is of the same color. It is caused by different wavelengths of light rays focusing in different planes in the image, causing some colors to be slightly out of focus. One of the differences between lateral and longitudinal chromatic aberration is that the former has two different colors on each side of an object, while the latter has only one color surrounding the object. Some corrections can be done in Photoshop and in specialized image-enhancement programs. See also chromatic aberration; lateral chromatic aberration
