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romansellier
Participating Frequently
January 15, 2020

P: Automatic lens correction for Sigma 14-24 dg dn leads to vignette overcorrection

  • January 15, 2020
  • 22 replies
  • 1205 views

Hello, I would like to let you know that currently the lens profile of the Sigma 14-24 dg dn in Lightroom leads to a visible overcorrection of vignetting, especially at 14 or 15mm.
This happens when you just enable the automatic lens correction, with distortion and vignetting values set to standard values of 100.
I have attached an image taken at 14mm, the automatic lens correction in Lightroom being enabled.

One can clearly observe a white area including a thin white curve in the left and right corner of the image which is kind of disturbing.

Currently I am able to adjust this by significantly reducing the vignetting value to approximately 30-50, but it is only a workaround and it also depends what value for the distortion is set.

It would be very helpful if you could have a look at this and modify the lens correction profile of the Sigma 14-24 for Sony. 

Thanks.

    This topic has been closed for replies.

    22 replies

    N
    Nick Rosen Photography
    Participant
    October 30, 2023

    Its almost 2024, why is this not fixed? I just purchased this lens and my lightroom is up to date but the profile still overcorrects vignetting.

    F
    FeedbackCommunityMember
    Inspiring
    February 27, 2021

    @Rikk I’m seeing the same thing happening with my Sigma 24-70mm 2.8 ART on my Sony A7RIII. Happy to send my raw files in too. 

    S
    scottn7461818
    Participating Frequently
    April 21, 2020
    I sent Sigma a note asking them why this is happening. Would you mind also following up with them? I'm obviously not the only one with this issue.
    I find that I have to disable the LR lens profile to do the vignette correction but then I have to also manually do the distortion correction. If we don't get this resolved, can you release a lens profile with only the distortion correction?
    For reference, I've attached 2 images taken of a uniform blue sky which were rendered using the newest (V2) LR profile.
    Todd Shaner
    Todd Shaner
    Legend
    April 20, 2020
    The Sigma 14-24mm F2.8 DG DN A019 lens is showing as first supported in LR 9.0, which was released November 2019. The lens itself was first available September 2019 so it's likely Adobe has an early production lens sample. Anything's possible including sample-to-sample manufacturing tolerances variation.
    S
    scottn7461818
    Participating Frequently
    April 20, 2020
    Thanks for finding that update. Only the L mount version was updated and the Sony E mount.
    My lens was purchased from a high volume distributor in March so I assume it represents the latest production version. The serial number is 543964XX (I would rather not reveal the last 2 digits on a public forum). Was the Adobe sample an early version?
    Todd Shaner
    Todd Shaner
    Legend
    April 20, 2020
    OK, I can see the over-correction in the uploaded ARW files using the updated v2 profile. I suspect your lens sample is different than Adobe's. I discovered there was a firmware update issued 03/18/2020 for this lens that specifically states, "This firmware update improves the performance of the Vignetting Correction."


    https://www.sigma-global.com/en/download/lenses/firmware/

    https://www.sigma-global.com/en/download/lenses/firmware/popups/a019_14_24_28/index.html

    https://www.sigma-global.com/en/download/lenses/firmware/a019_14_24_28/
    Not sure how you would update the lens firmware with a Sony camera, but that may fix the issue.
    S
    scottn7461818
    Participating Frequently
    April 19, 2020
    https://www.dropbox.com/sh/7nqs8gyzir...
    Todd Shaner
    Todd Shaner
    Legend
    April 19, 2020
    You can copy the folder link on Dropbox and paste it in a reply here. On Dropbox click on the three-dots icon to the right of the folder and select Copy. Thank you!
    S
    scottn7461818
    Participating Frequently
    April 19, 2020
    Your attention to this issue is greatly appreciated Todd.
    I've taken shots at f2.8 and f8 at 2 different focus points of uniformly lit blue sky and 3 focus distances of the north side of my house. Unfortunately the house shots show my diffuse shadow in the center. Hopefully they are still useful. 
    The files are big, 10 images at about 40 MB each. What's the best way to upload them? I can email you a link to them in a Dropbox folder if you like.
    Todd Shaner
    Todd Shaner
    Legend
    April 16, 2020
    This may be due to lens manufacturing differences.  Manufacturers often "revise" products to correct manufacturing issues.The lens sample Adobe used may be a different revision than the sample you purchased. Can you upload some ARW files shot at 14mm F 2.8 and F8. Shoot an evenly lit and even toned subject such as the side of a building or house. Composing the shot with a straight line object (roof line, siding line) aligned near the edge of the frame will allow checking distortion correction as well.
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