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Chromatic aberration – poor correction

Phillip Bond
I am shooting with a Sony A7R and Canon EF lenses via the Metabones adapter. (primarily the 17 and 24mm TS-Es but a few others as well).
I am currently using Lightroom 5 as my RAW conversion (and file management) tool.

I've had a look at Capture One 8 and the main thing holding me back from using C1/8 is it's handling of chromatic aberration – as compared to LR5.

I have not tested extensively but the files I've looked at so far suggest that LR5 handles it better than C1/8. Also I will say that I've only compared the automatic corrections using both software. Just checked the CA box and compared the results.

Is there some way to tweak C1/8 to yield better results? I know that LR has a manual way of achieving better results if the automated correction doesn't do a good enough job. Does C1 have a similar facility?

I would appreciate any advice the forum might offer.

Thanks,
Phil
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  • Paul Steunebrink
    Have you done the CA analysis in CO8's lens correction tool?
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  • Phillip Bond
    Are you referring to the ellipsis next to the Chromatic Aberration check box, that reveals the "Analyze" option?

    I didn't know about that yesterday.
    I just tried it this morning and, if anything, it actually made it worse –- on the extremes of the image, that is. It might have led to improvements more towards the center but this lens doesn't have any issues there at all.
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  • Phillip Bond
    I just noticed the "Movement" tab.
    Since I'm using a TS-E lens I entered the amount of vertical shift and it made a bit of improvement.

    What I now need to do is test with more images before I draw too many conclusions.

    Other's experiences are welcome.

    Thanks
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  • Phillip Bond
    I have now tested several files taken with the Sony A7R + Metabones adapter + Canon 24 TS-E II.
    The files I tested all had varying amounts of fairly extreme shift applied and, as a result, had some amounts of visible chromatic aberration.

    I am admittedly not very familiar with Capture One however I could not get the Capture One files to reduce the chromatic nearly as well as Lightroom seemed able to do on the same files – automatically.

    Can anyone tell me that there is something I should be doing that I am, perhaps, missing?
    Or else confirm similar experiences?

    Thanks all
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  • Drew Altdo
    Get a file to support to review.
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  • Phillip Bond
    I'd be glad to provide files to exemplify what I mean.
    Rather than to include small JPGs or screen captures of what I'm seeing I think it would be best to provide a RAW file for anyone willing to experiment with, to see if they can achieve better results with Capture One.

    The file was produced by the Sony A7R and a Canon 24 TS-E II via Metabones adapter. I used approximately 10mm of rise on this shot.

    1. Using Lightroom 5 the automated chromatic aberration function appears to clear up CAs in the entire image, with few noticeable artifacts. (I'm looking primarily in the upper left corner of the image).

    2. With Capture One 8 I am able to clear up a good deal of the CAs in the upper left corner by using the automated CA function (Analyze Image) along with some amount of shift in the Movements tab. However when I use shift to fix the CA in the upper left of the image it introduces fringing in the image center (seen around the small round lights surrounding the sign in the center of the building).

    Here is a link to the RAW file:
    http://www.philbondphotography.com/img/ ... ubXPxn1EE=

    I would appreciate any insights or advice anyone might have.

    Thanks,
    Phil
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  • Robert Davis
    Yes CA correction is poor in C1. Version 8 is no better. I use just about every Raw processing software available and it lags behind much of the competition in this regard. I sent some examples to the Image Professor on the Phase blogs and he conceded that it needed looking at. Quite often I end up having to convert to TIF and correcting in Lightroom.

    This would be made much easier if Capture One exported to other applications properly without having to go in a roundabout fashion. But that is a different issue entirely! Capture One does so many things better than the competition (which is why I use it) but is so lacking in other areas it is frustrating.
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  • Phillip Bond
    Thank you for confirming my observations.
    Actually I was more hoping that someone would tell me that I there was something I had overlooked.

    I too find it frustrating to have to bounce between applications in order to arrive at a finished product. More to the point I suppose is that it forces me to make certain corrections at different points in my workflow that I would otherwise do them.

    I sure hope that the issue of CA correction is addressed soon.

    Thanks again.
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  • ChrisM
    [quote="NN159196UL" wrote:
    Thank you for confirming my observations.
    Actually I was more hoping that someone would tell me that I there was something I had overlooked.

    I too find it frustrating to have to bounce between applications in order to arrive at a finished product. More to the point I suppose is that it forces me to make certain corrections at different points in my workflow that I would otherwise do them.

    I sure hope that the issue of CA correction is addressed soon.

    Thanks again.

    Well, just to add a bit of nuance to this issue: I use a Sony A7r myself, with CZ lenses, and although this is a wonderful camera, the level of CA can be quite heavy, and I wouldn't state it as the obvious that CO1 does a bad job at removing chromatic aberrations going by the fact that it cannot effectively repair the heavy levels of CA as well as purple fringing that the Sony A7r can produce with dslr lenses via an adapter. For the record: CO1 cannot remove the heavy purple fringing in the outermost corners of my CZ 28/2 distagon on the Sony A7r, and perhaps other programs will do abetter job, but at the same time, these CA levels are quite extreme. Use the Sony A7r with dedicated FE e-mount lenses, and you may well find that CO1 does effectively remove the CA's. I use a Pentax K3 dslr also with the same CZ 28/2 lens, and although this is a crop camera, even in the image centre, this camera produces about a quarter of the level of CA that the Sony A7r produces with the same lens. Most likely the thick sensor glass topping induces abnormal levels of CA with none optimized wide angle lenses (used by means of an adapter) such as your 24mm lens. Not all of the resulting problems can be automatically attributed to weaknesses in CO1, even if other programs get better results through heavy handed CA removal.

    Chris
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  • Phillip Bond
    The Canon 24 TS-E (even on the A7R via adapter) produces comparatively low levels of CA. Noticeable CA is present only at relatively high amounts of shift.

    However that's not really the point. The point I'm making is that Lightroom seems to handle whatever CA is present much better than C1 appears to.
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