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DPChallenge Forums >> Tips, Tricks, and Q&A >> Canon 24-70 f2.8 ii Chromatic Aberration
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Showing posts 1 - 6 of 6, (reverse)
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02/28/2015 10:51:23 AM · #1
I just got a new (used) lens and was a little surprised by the fringing. Does anyone else who has this lens have this same problem or is there something wrong with this one? This is a near 100% crop at f/2.8 and 70mm.

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02/28/2015 11:13:58 AM · #2
thats really minor...

how is it when you should against something severely backlit?

02/28/2015 11:15:27 AM · #3
//www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=787&Camera=963&Sample=0&FLI=4&API=0&LensComp=0&CameraComp=0&SampleComp=0&FLIComp=0&APIComp=0

CA is so easily removed in post, i wouldn't be too concerned. from the link above its look normal, at least at the edges.

Message edited by author 2015-02-28 11:17:25.
02/28/2015 12:34:56 PM · #4
I must be quite bad at post because everything I've been trying in Aperture or Lightroom doesn't seem to fix it. I can make it ok in one spot but then it still looks terrible in another. But that really only applies to in-focus stuff. The out of focus, like in this picture, I can't do anything with. I saw this most notably in out of focus regions of a highly backlit scene.

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02/28/2015 01:20:46 PM · #5
anything at 2.8 is going to be suffering a bit, have you used the lens correction profile in lightroom

my mark 1 and older 28-70 on my full frame bodies don't look that fluffy
02/28/2015 01:25:11 PM · #6
What you're seeing is axial (longitudinal) CA, which affects out-of-focus areas. Unlike lateral CA, it's not possible to easily correct it in software. Nearly all lenses will have some axial CA; fast lenses shot wide open will show it the worst, and WA lenses moreso than longer focal lengths.
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