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Canon 70-200 f/4L IS chrom. aber. WTF?
- Thread starter jwt
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I don't have the IS version but I see a tiny amount of CA in extreme light conditions with mine if focus is not right on. That looks pretty soft...
Looks more like purple fringing to me. This is not purely chromatic aberration and has more to do with the sensor (blooming, etc.) There is disagreement among the photography community as to what exactly causes purple fringing.
Happens when there is an "overexposed" area right next to an underexposed area (i.e. areas of high contrast). The purple fringing goes down if you use a UV filter and keep the f-number at f/4 or higher.
Happens when there is an "overexposed" area right next to an underexposed area (i.e. areas of high contrast). The purple fringing goes down if you use a UV filter and keep the f-number at f/4 or higher.
Looks to me like an image processing artifact. Where you shooting JPG format? I think it has to do with Bayer interpolation across the white/black boundary. If this is a raw image it would be good to see if other raw processors have the same problem.
If it were a lens issue then the fringing would have been in a radial direction away from the center point of the image. This follows the line and is either a sensor or image processing artifact.
