Defringe adjustments
The Defringe controls are designed to fix axial (longitudinal) chromatic aberration. This can be caused due to ghosting, lens flare, charge leakage (which affects some CCD sensors), as well as color aberrations.
Unlike lateral chromatic aberration, which occurs toward the edges of the frame, this type of aberration can appear anywhere in an image. It particularly affects fast, wide-aperture lenses and is typically most noticeable when shooting at the widest lens apertures, where fringes will usually be at their most visible just in front of and just behind the plane of focus. These will typically appear purple/magenta when they are in front of the plane of focus, and appear green when they are behind the plane of focus. ...
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