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Dealing with longitudinal chromatic aberration

sasler
Hey guys,

coming from Lightroom, I don't know how to deal with LoCA/bokeh fringing/green fringing in Capture One (Windows). In Lightroom there are sliders for purple und green fringing. In C1 I only see one slider for purple fringing (that actually doesn't help that much) and nothing for green fringing.

How do you deal with LoCA in Capture One?

Greetings
Sascha
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  • SFA
    sasler wrote:
    Hey guys,

    coming from Lightroom, I don't know how to deal with LoCA/bokeh fringing/green fringing in Capture One (Windows). In Lightroom there are sliders for purple und green fringing. In C1 I only see one slider for purple fringing (that actually doesn't help that much) and nothing for green fringing.

    How do you deal with LoCA in Capture One?

    Greetings
    Sascha


    Firstly - always check the results at at least 50% of image size - preferably 100%.

    You know about the Purple Fringing correction tool.

    In the Lens Correction tool you also have adjustments for Diffraction and Chromatic Aberration.

    Start with discovering their capabilities and whether they meet your needs.

    If they do not meet you needs you likely need to look at something using Layers based on colour selection but I find I only need to consider that options for one very old and manual 600mm lens that has some problems with Purple Fringing in some specific light/dark boundaries when sunlight is coming from a specific and quite narrow angle. It's not a lens I use very often ...



    HTH.


    Grant
    0
  • sasler
    Hello Grant,

    thank you for your answer. I already tried single color selection while using layers, but I can't get rid of the problem.

    I made an example showing the green fringing in the bokeh at the center and right-hand part of the image. The lens used is a Samyang/Rokinon AF 35mm f2.8 for Sony E-Mount. Note: This is a heavy crop. Please take this just as an example. In some images the fringing can already be seen on a 1080p screen without zooming in.



    I really don't know how to get rid of the green fringing ☹️

    Greetings
    Sascha
    0
  • SFA
    sasler wrote:
    Hello Grant,

    thank you for your answer. I already tried single color selection while using layers, but I can't get rid of the problem.

    I made an example showing the green fringing in the bokeh at the center and right-hand part of the image. The lens used is a Samyang/Rokinon AF 35mm f2.8 for Sony E-Mount. Note: This is a heavy crop. Please take this just as an example. In some images the fringing can already be seen on a 1080p screen without zooming in.



    I really don't know how to get rid of the green fringing ☹️

    Greetings
    Sascha


    I don't think that is lens related green fringing of the sort you think it is.

    My first thought it that I cannot see anything that is a problem. So I looked harder and saw 2 blades of grass that look like they have green edges and a white centre - but some grass is like that so I would not have thought much about it during normal viewing.

    When you are dealing with bokeh and soft focus there is nothing much that lens correction approaches will be able to correct. The processing ''rules' related to identifying and clearly defining any 'standard' problems would be very hard to reproduce for out of focus areas without simply blending everything together in some way. Or perhaps 'correcting' something that should not be corrected?


    Just my opinion.

    Let us see what others think.


    Grant
    0
  • sasler
    I get the same green fringing (and the counterpart purple fringing as it is axial CA) when shooting my wife with this lens at f2.8. Never saw that shiny green aura around her in real life tbh 😂

    As i still have a Lightroom sub, I can say that I can get rid of most of it very easily with the sliders provided there. I'm a bit disappointed right now 😭

    Greetings
    Sascha
    0
  • SFA
    sasler wrote:
    I get the same green fringing (and the counterpart purple fringing as it is axial CA) when shooting my wife with this lens at f2.8. Never saw that shiny green aura around her in real life tbh 😂

    As i still have a Lightroom sub, I can say that I can get rid of most of it very easily with the sliders provided there. I'm a bit disappointed right now 😭

    Greetings
    Sascha


    Getting rid of something is always possible I suppose. Whether, as a need for correction, what the adjustment gets rid of should be got rid of is another matter.

    If you have any other images with a more evident example of the problem that does not involve grass or anything green they might be a more useful starting point. Preferably a RAW file of course. And viewed at 100% not a version with some compression.



    Grant
    0

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