This is a feedback type of comment.
Chromatic aberration is much worse in LR 4.x than previous versions. Purple fringing is comparable to Powershot GS1, circa 2002 0- pre LR.
I shoot swim meets - very bad lighting. Light sources are often unavoidable. LR3.x controlled chromatic aberration very well - could eliminate most purple fringing. LR4.x not so well. Just processed 1,000+ meet photos. Purple fringing really bad in all versions of LR4.x - 4.0 beta, 4.0 & 4.1RC. Mac OS 10.7.x, EOS 7D (two bodies), 17-55 f2.8, 70-200 f2.8 (latest model). Also S95 & S100..Otherwise a terrific product.
Can we work to get chromatic aberration back to as good as it used to be?
Neither LR3 nor LR4 have much besides the fringing tool to control purple fringing. PF is caused by axial (longitudinal) CA, and the tools in LR, profile, manual or automatic, are all for the other type - lateral CA.
I'm shooting with Canon 300D, 600D, and 5D MKII bodies and Canon 18-55mm IS, 17-40mm, 70-200mm IS F4 with no "fringing issues as you describe. Are you checking the 'Remove Chromatic Aberration' box under 'Lens Corrections, and are the lenses being properly identified under 'Lens Profile' selections? By default it is unchecked (no Chromatic Abberation removal). Also, the two Canon SLR lenses you have posted (17-55 f2.8, 70-200 f2.8) don't have "fringing" issues, so I'm not sure what you are seeing in the images with these two lenses. Can you post 100% screen shots with details?
As Lee Jay mentioned, if this is Axial CA (i.e. Purple Fringing) it can be partially to fully corrected using the 'Defringe" > 'All Edges' tool under 'Manual' Lens Corrections. But this still doesn't explain the differences you are seeing between LR3 and LR4 Lens Corrections behavior.
Are you checking the 'Remove Chromatic Aberration' box under 'Lens Corrections, and are the lenses being properly identified under 'Lens Profile' selections? By default it is unchecked (no Chromatic Abberation removal).
Actually, in LR4 the Auto CA is not connected to the lens profiles anymore. It's auto-calculated from the image and doesn't not depend on the lens profile. And you are right at this point the the only other way to address is the Defring option...
Good point, but If the OP has changed his Lens Profile "default settings" to include Chromatic Abberations (i.e. checked) this may still produce what he is seeing. If some of the imported image files mistakenly got set with the wrong or NO Lens Profile, he may not be aware that Chromatic Abberration correction is not being applied to them. As he said, "Just processed 1,000+ meet photos."
I am the author of the oritinal question.
First, I apologize for the delay in following up. My job and family commitments slowed me, but I did work.
It was helpful to see that axia CA was not corrected by LR4.1 RC 1. I reexamined my photos and confirmed this.
As a loyal LuLa (Luminous Landscape) reader and consumer of its Jeff Scewe's and Michael Reichman's LR video tutorials, I downloaeded the most recent releases of videos, and watched the one where Jeff discusses CA, further reinforcing the answer.
Late last nigh (early today), I noticed the second release candidate for LR 4.1, and that it corrected for axial CA. I also noted the excellent article on the subject by Eric Chan. I immediately downloaded RC 2 and reworked several photos. Problem solved.
Here is the URL for the Chan Article. http://blogs.adobe.com/lightroomjournal/2012/04/new-color-fringe-corre ction-controls.html
The problem is as described by Mr. Chan. In my case, shooting conditions and restrictions forced shooting fast lenses wide open directly into artifical light sources in the background and splashes of water generated by swimmers. The first created the purple fringing that occurs with high contrast edges that may be in the plane of focus shooting fast lenses wide open. The second were generated using a wide open (f2.8) 70-200mm lenses with a very narrow depth of field where the splashes were in front of the plane of focus. I had not really noticed the green fringing until I read Mr Chan's article. RC 2 did a good job handling both types.
Thanks for the help and support. I have noted that my question has been answered.