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Canon EF 11-24mm f/4L USM

Color Fringing, Uncorrected and Corrected, Optical Misalignment? (5DS R)

The one obvious weakness of the Canon 11-24mm f/4L USM that is muted on a 22-megapixel camera like the Canon 5D Mark III makes itself prominent on the 50-megapixel Canon 5DS R: red/cyan color fringes of lateral chromatic aberration. But how much of this is the design and how much is optical assembly mistakes is subject to speculation, as the crops show.

Example — corrected and uncorrected

Some of this color fringing appears to be due to less than perfect optical assembly. In a highly corrected lens wish such ambitious goals, even a minor error can generate various aberrations, particularly at the periphery, and here we see compelling evidence that something is off, since only the left side shows color fringing.

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Variants uncorrected,corrected available in full article
f4 @ 1/400 sec, ISO 100; 2015-07-10 13:40:06
Canon EOS 5DS R + Canon EF 11-24mm f/4L @ 16mm

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