EXCERPT page containing first few paragraphs. 2020-01-23 17:57:35
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The Canon 11-24mm f/4L USM is a highly corrected lens but on the 50-megapixel Canon 5DS R there is red/cyan color fringing as shown in the Color Fringing, Uncorrected and Corrected, Optical Misalignment?
Much less common—indeed rare in my experience—is the presence of lateral chromatic aberration of the blue/yellow type, as is shown in this example—usually blue halo effects are longitudinal chromatic aberration, which disappears quickly with stopping down and not often found with an f/4 lens. Not so here where the color fringing is blue and of the lateral type—it does not improve with stopping down.
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