Originally posted by Parallax That looks about like mine other than I apply the lens corrections first.
The problem with applying the lens correction early is that distortion correction usually involves extrapolation to build new pixels and/or selective sampling for removal of original pixels. My understanding is that the regions where this is applied are more vulnerable to artifact on later edits. I should note that my version of LR does not support automatic distortion correction, so things may be different in versions that do support that feature.
In regards to CA correction, I am not sure how that works, though in practical terms, I have noticed that the false color associated with CA is often intensified by changes to contrast or color balance. Doing the CA correction last helps make sure that the correction is adequate and lessens the possibility of haloing artifact.
All that being said, I must confess that I often apply both distortion correction and CA correction fairly early in the process. Though with PT Lens, it is always the final step when I use it since it is always an edit on a non-RAW source.
Steve
Last edited by stevebrot; 03-07-2014 at 02:10 PM.