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Lens correction for the Nikkor 24-120mm 1:4 G Ed

pierre debuysscher
The lens corrections applied by C1 (8.3.3) for my AF-S Nikkor 24-120mm 1:4 G ED combined with my D750 seem to be largely incorrect for geometry and for chromatische abberation, especially at the wide-angle side of the zoom range. Anthony else having the same observation? This lens is known for generating a lot of distortion but would different lens samples differ much in the distortion they generate?

Thanks.
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Comments

8 comments

Date Votes
  • Andriy.Okhrimets
    I do have same lens, and here is my observation on 24 mm lens distortion is not corectable both with Lightrom and C1 it some kind uncontrolled, so I do observe distortion, that`s why for wideangle shots swiched to ziess but it is a separate story.
    😄
    chromatische abberation is fixed by separate check. But do not forget there is ... button close to check mark that need to be pressed to re-analize image if you are not happy with default results. That works much better for hard cases where by default after cropping I've observed a lot of issues. Clicking analyze improved results after re cropping
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  • pierre debuysscher
    Thanks for the feedback. I understanding that re-evaluation for chromatische abberation helps most of the time. I was just wondering why the default corrections applied by C1 for this lens seems far from correct. Manual corrections do work and are ok but I would have expected the profile provided by C1 to do a better job, that is what it is expected to do😉

    However if sample differences for this lens would be substantial, then there is no way C1 could not do a beter job.
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  • Andriy.Okhrimets
    I understanding that re-evaluation for chromatische abberation helps most of the time.


    You just answered your question, use it most of them time, and lens correction is hugely dependendant from a perspective so use keystone for your file, and combined with lens correction. And as I understand PO depends on third party providing lens profiles, but again both LR and C1 gives comparable results, and not of them are excellent without keystone correction.
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  • Christian Gruner
    [quote="Andriy.Okhrimets" wrote:
    I understanding that re-evaluation for chromatische abberation helps most of the time.


    You just answered your question, use it most of them time, and lens correction is hugely dependendant from a perspective so use keystone for your file, and combined with lens correction. And as I understand PO depends on third party providing lens profiles, but again both LR and C1 gives comparable results, and not of them are excellent without keystone correction.


    Keystone and Lens-correction are 2 very different things. Keystone corrects perspective, lens-correction corrects optical distortion, fall-off and so on.

    Read more here: http://help.phaseone.com/en/CO8/lens-correction and http://help.phaseone.com/en/CO8/keystone
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  • Andriy.Okhrimets
    Christian I know that but for me keystone helps to make optical distortion less visible for example in corners.
    Side question am I right that PO get this profiles from third party?
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  • Christian Gruner
    [quote="Andriy.Okhrimets" wrote:
    Christian I know that but for me keystone helps to make optical distortion less visible for example in corners.
    Side question am I right that PO get this profiles from third party?


    Nop, the lenses are profiled here at the HQ in Denmark, and embedded into Capture.
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  • Andriy.Okhrimets
    Thank you that is great thing to now, that you not relying on third party.
    💡
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  • pierre debuysscher
    Nop, the lenses are profiled here at the HQ in Denmark, and embedded into Capture.[/quote]

    Christian,

    - are you aware of any substantial variations for this lens in chromatische abberation or geometry?
    - have you ever had a similar remark from other customers?

    Thanks,

    Piet.
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