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Color Fringing

Color fringing, the result of chromatic aberrations [see (1) and (2)] is a problem with many lenses, but is particularly an issue with shift lenses because of their extra-wide field of view, which tends to exacerbate the problem.

Color fringing manifests itself as red and cyan/green borders on higher contrast edges.  In more severe cases, it also results in an overall blurry look to image detail.   Color fringing in a quality lens should not appear in the center of the frame, but will increase as the edges of the image circle is approached.

Here is an example of severe color fringing (actual-pixels crop from D2X with Nikon 10.5mm/f2.8DX, corner of the frame):

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