Green CA

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Archive 2007 · Green CA

majo d
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p.1 #1 · Green CA

did someone notice green CA? I've got it on my canon 50/1,4, here's example
http://portfolio.yw.sk/gca.PNG

I thought, that CA should be red, violet, or just colors from the end of color spectrum and green is right in the middle...
thanks for any ideas.

Dec 16, 2007 at 09:59 AM

Sam N
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p.1 #2 · Green CA

This is longitudinal CA, which is different from the usual transverse CA that ACR can correct.

Basically things behind and in front of the image plane will have color fringes of different colors.

More info here:
http://www.vanwalree.com/optics/chromatic.html

Dec 16, 2007 at 11:08 AM

majo d
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p.1 #3 · Green CA

I don't use ACR because I have feeling, that it's too slow. I use LR and there's quite difficult to correct this CA

Dec 16, 2007 at 11:11 AM

Andrew J
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p.1 #4 · Green CA

CA can be any color and the cure is stopping down.

Dec 16, 2007 at 11:16 AM

Sam N
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p.1 #5 · Green CA

The CA corrections in ACR are the same as the ones in Lightroom, and neither of them will help with longitudinal CA.

Dec 16, 2007 at 09:13 PM

mcbroomf
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p.1 #6 · Green CA

I believe that there is magenta CA in that image as well, it's just that there is a lot of red in the image and the fringe is less noticeable.

Dec 17, 2007 at 03:20 AM


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