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RASouthworth
RASouthworth
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Lens Correction problem - double vignetting?

May 28, 2010 8:38 AM

On some but not all of older images, with xmp's deleted and all caches cleared, I end up with a over vignette effect, as shown below.  Haven't been able to correlate it with other than images previously processed in 2003 then 2010.  The .nef file date did not change.  And before somebody asks the manual controls were all at neutral.  D300 and 16-85VR lens with downloaded profile.

 

Richard Southworth

 

DoubleVig.jpg

1713 Views   23 Replies   Latest reply: Tai Lao, Jun 1, 2010 12:19 AM
 
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  • John Cornicello
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    1. John Cornicello,
    May 28, 2010 11:01 AM   in reply to RASouthworth
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    Are there any adjustments made in the FX panel?

     
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  • RASouthworth
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    2. RASouthworth,
    May 28, 2010 11:30 AM   in reply to John Cornicello
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    No, mostly ACR defaults except Blacks=0 and Strong Contrast, along with Lens Corrections.  Here's a link to the original .nef:

     

    http://rgbaustin.com/S10_5685.zip

     

    Richard Southworth

     

    Added by edit - I've taken several more shots, both with the 16-85VR and the 55-200VR and have not seen this problem, all have corrected well.  I have only found a few images that appear over corrected.

     
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  • John Cornicello
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    Mar 31, 2003
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    3. John Cornicello,
    May 28, 2010 11:42 AM   in reply to RASouthworth
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    I'm on an old machine at the moment, and don't have CS5 installed, but the file opened and looked fine (no light vignetting) in Lightroom 2.7.

     
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  • RASouthworth
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    4. RASouthworth,
    May 28, 2010 11:47 AM   in reply to John Cornicello
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    It looks fine to me also, in either CS4 or CS5 with no lens correction.  It's only if I invoke the auto lens correction in ACR 6.1, using the downloaded 16-85VR profile, that the light vignetting appears.

     

    I'm not familiar with Lightroom 2.7, is it also using the downloaded profile for auto lens correction?

     

    Richard Southworth

     
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  • John Cornicello
    784 posts
    Mar 31, 2003
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    5. John Cornicello,
    May 28, 2010 11:50 AM   in reply to RASouthworth
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    No, it does not. It was just the only thing I had available to open the file with. Hoping others can jump in with some ideas.

     
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  • Hudechrome-sd9sPI
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    6. Hudechrome-sd9sPI,
    May 28, 2010 2:57 PM   in reply to John Cornicello
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    It may be due to an erroneous profile, or perhaps a double profiling by the profiler.

     

    If you have access to DXO Pro, run it there and compare.

     

    Is there any there any possibility the file has been run through a vignetting correction? Because of all the possible tripping up, when I use DXO, I have a second set of RAW files reserved apart from the ones obtained by using Bridge to upload. DXO has comments about this, and so far as that is concerned, Nik software does also. Unfortunately, this results is some rather huge demands on storage.

     

    I have run both the Bridge upload and the independent upload through ACR and so long as non of the image correction processes are employed, just the lens corrections, I found no problems. Still, on important shoots, I do both then edit out the ones for which I have to have excellent geometric corrections. Cloud photos, who cares.

     
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  • RASouthworth
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    7. RASouthworth,
    May 28, 2010 7:06 PM   in reply to John Cornicello
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    Ok, did a more thorough job of testing the 16-85VR downloadable profile.  It works fine at 16 and 85, but at intermediate values (my tests were done at 35 and 50) it exhibits extreme vignetting over-correction, with the vignette slider at default (100).  At the intermediate values the vignette slider must be reduced to approximately 20 for acceptable results.

     

    So how do we report to Adobe that a submitted profile does not work properly?  I'll duplicate this post in the "Lens Profile Creator" forum.

     

    Richard Southworth

     
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  • RASouthworth
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    8. RASouthworth,
    May 29, 2010 6:42 AM   in reply to RASouthworth
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    Shot the proverbial brick wall this morning at 42mm, very evenly illuminated.  Vignetting correction with slider at 100 yielded the attached image.  Slider at 20 corrects ok.

     

    Adobe please help, this profile should not have made it thru your screening process.  Other than this problem it works well.

     

    Also posted in Lens Profile Creator forum.

     

    Richard Southworth

     

    BrickWall.JPG

     
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  • Hudechrome-sd9sPI
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    9. Hudechrome-sd9sPI,
    May 29, 2010 8:58 AM   in reply to RASouthworth
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    It also looks like your camera was not positioned  normal  to the wall and level.

     

    It also appears to have residual barrel distortion, but without the correct placement, one can't be sure. I have seen brick walls that have sagged as well.

     

    None of this would affect vignetting, however.

     
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  • Yammer P
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    10. Yammer P,
    May 29, 2010 9:02 AM   in reply to RASouthworth
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    I've just done a brick wall test with my 16-85mm at 42mm and f/4.8. This is what I get with the D300/16-85mm profile:

     

    _KN20545.jpg

     
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  • Yammer P
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    11. Yammer P,
    May 29, 2010 9:16 AM   in reply to RASouthworth
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    This is what I get using the profile:

     

    S10_5685.jpg

     

    Maybe there's something wrong with your copy of the downloaded profile?

    BTW, mine is called "Nikon D300 - Nikon AF-S DX NIKKOR 16-85mm f/3.5-5.6G ED VR"

     
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  • RASouthworth
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    12. RASouthworth,
    May 29, 2010 9:37 AM   in reply to Yammer P
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    Yammer P,

     

    Thanks for downloading my image, looks like I have some sort of problem at my end, or at least a difference.  Can you do a CR screenshot, similar to the one I posted?

     

    I deleted the profile, downloaded a fresh copy, same results.  I've reset CR defaults, etc. with no success.  Strange stuff, I'll keep digging.

     

    Richard Southworth

     
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  • Yammer P
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    13. Yammer P,
    May 29, 2010 10:11 AM   in reply to RASouthworth
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    How's this?

    All settings at default, except Lens Correction, set as shown.

     

    Untitled-1.jpg

     
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  • RASouthworth
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    14. RASouthworth,
    May 29, 2010 12:11 PM   in reply to Yammer P
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    Thanks again, still no answer.  Reinstalled CS5, backed up to ACR 6.0, problem exists within PS using Lens Correction and downloading profile.  So I guess it's a PS problem on my system.  Tried 32bit and various other combinations, always the same, as soon as I invoke the downloaded 16-85VR profile I get the over lightened borders with vignette correction.

     

    Richard Southworth

     
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  • Yammer P
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    15. Yammer P,
    May 29, 2010 12:40 PM   in reply to RASouthworth
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    What does it look like with Camera Raw defaults?


     
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  • Yammer P
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    16. Yammer P,
    May 29, 2010 12:45 PM   in reply to RASouthworth
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    I'm not sure if it's related, but I'm also experiencing something weird in another raw image. It has develop settings and a tilted crop applied, with the symbols on the corner of the thumbnail in Bridge. When I create a JPEG from it in the same folder, it also gets the thumbnail symbols. If I clear develop settings on both images they look like the originals. If I delete the XMP file, they both acquire the settings and icons again!

     

    I can't work out where it's coming from. I'm wondering if there's settings coming from somewhere else, as I didn't think you could store settings in a NEF file.

     
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  • Currently Being Moderated
    17. Tai Lao,
    May 29, 2010 1:02 PM   in reply to RASouthworth
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    Please help me grasp this, Richard:

     

    What in this image made you want to apply lens correction to it?  I opened it in ACR 5.7 with no lens correction whatsoever and I can find no lens distortion anywhere in it.  See screen shot below.

     

    Or is the issue that ACR 6.x is applying the correction by default?  I don't have CS5 as it does not run on my PPC machine, so I can't test ACR 6.x.

     

     

    A_NEFsample.jpg

     

     

    Thanks in advance.

    Wo Tai Lao Le
    我太老了
     
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  • RASouthworth
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    18. RASouthworth,
    May 29, 2010 1:17 PM   in reply to Tai Lao
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    No, the image looks fine with no correction applied, I was just testing the auto lens correction feature, both within Photoshop CS5 and ACR6.1 (they use the same profile).  And CS5 does not apply the correction by default unless set up for such in ACR6.1.

     

    Richard Southworth

     
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  • Currently Being Moderated
    19. Tai Lao,
    May 29, 2010 1:34 PM   in reply to RASouthworth
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    Ah!  Thanks for the explanation.  Makes perfect sense to me now.

     

    Wo Tai Lao Le

    我太老了

     
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  • Yammer P
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    20. Yammer P,
    May 29, 2010 1:38 PM   in reply to RASouthworth
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    This is what the ACR screen looks like with no adjustments:

     

    Untitled-0.jpg

    You can compare this directly with the one in my post 13 above.

     
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  • MadManChan2000
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    21. MadManChan2000,
    May 31, 2010 8:09 PM   in reply to Yammer P
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    I posted a response over in the ALPC forum.

     
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  • John Cornicello
    784 posts
    Mar 31, 2003
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    22. John Cornicello,
    May 31, 2010 8:50 PM   in reply to MadManChan2000
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    Here's a link to the other discussion: http://forums.adobe.com/thread/648808?tstart=0

     
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  • Currently Being Moderated
    23. Tai Lao,
    Jun 1, 2010 12:19 AM   in reply to MadManChan2000
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    MadManChan2000 wrote:

     

    I posted a response over in the ALPC forum.

     

     

    John Cornicello has already elucidated by posting the link, thank you, but for those who may be as puzzled as I was "ALPC" forums stands for Adobe Labs Profile Creator forum.

     
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