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pwillyamsnz
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Display subject distance in Lightroom metadata

Dec 12, 2010 3:13 PM

The EXIF data in the Lightroom database includes SubjectDistance but this does not appear in the Metadata windows.  It would be very handy if it was.

 

(forgive me if I have overlooked it).

(note: SubjectDistance is not recorded for all camera/lens combinations, eg 7D and Tamron does not)

 

As a further and natural extension, you could then easily calculate and display Depth of Field estimates (Near/Far limits and total DOF)

 
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  • Currently Being Moderated
    Dec 12, 2010 8:35 PM   in reply to pwillyamsnz
     
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    Dec 14, 2010 2:59 PM   in reply to pwillyamsnz

    pwillyamsnz,

     

    I think this metadata item was revoked by Adobe since it was unreliable / misleading.

     

    But, that doesn't mean they won't reinstate it if they find a way to improve it, or if too many users complain...

     

    ExifMeta is intended as an interim solution, not a substitute... and, I assure you - its of the highest quality ;-}

     

    Rob

     
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    Dec 15, 2010 1:41 AM   in reply to pwillyamsnz

    What was revealed when you queried the catalog? - did you see subject distance in there?

     
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    Dec 15, 2010 1:50 AM   in reply to pwillyamsnz

    I just checked - Lightroom 3.3 does display subject distance in Lightroom metadata.

     
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    Dec 18, 2010 4:45 PM   in reply to pwillyamsnz

    I wouldn't believe this if you told it to me, but here goes:

     

    It seems to have disappeared.

     

    I remember specifically noticing the value was off by .01 between what Lightroom was reporting and what ExifMeta was reporting, but now I can't find it anywhere!

     

    Ah - I found it! - I have no idea why sometimes it is present, and sometimes it is not.

     

    _sub_dist.gif

     

    R

     
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    Dec 30, 2010 5:32 PM   in reply to pwillyamsnz

    pwillyamsnz,

     

    Thanks for the info.

     

    A couple things:

     

    - The "Shooting Info" heading in the screenshot comes from the ExifMeta plugin which is also serving as my "metadata tagset factory". The heading in the screenshot springs from these lines in the ExifMeta configuration file:

     

    _ts1[#_ts1 + 1] = '{ "com.adobe.label", label = "Shooting Info" }'
    _ts1[#_ts1 + 1] = "'com.adobe.shutterSpeedValue'"
    _ts1[#_ts1 + 1] = "'com.adobe.apertureValue'"
    _ts1[#_ts1 + 1] = "'com.adobe.brightnessValue'"
    _ts1[#_ts1 + 1] = "'com.adobe.exposureBiasValue'"
    _ts1[#_ts1 + 1] = "'com.adobe.flash'"
    _ts1[#_ts1 + 1] = "'com.adobe.exposureProgram'"
    _ts1[#_ts1 + 1] = "'com.adobe.meteringMode'"
    _ts1[#_ts1 + 1] = "'com.adobe.ISOSpeedRating'"
    _ts1[#_ts1 + 1] = "'com.adobe.focalLength'"
    _ts1[#_ts1 + 1] = "'com.adobe.focalLength35mm'"
    _ts1[#_ts1 + 1] = "'com.adobe.lens'"
    _ts1[#_ts1 + 1] = "'com.adobe.subjectDistance'"

     

    i.e. I have explicitly specified the section label and each item to be in it.

     

    Although I haven't scrutinized anything under the hood to identify the criteria which determine when it is present and when it is not. So far, it seems freakun random - some pic's that were presumably handled the same way (same camera, same shoot...) have it and some not. I suspect there is some difference in handling that I'm not aware of, but it could just be a data thing too, I suppose, but I'm getting pretty far out on the proverbial limb at this point...

     

    R

     
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    Feb 28, 2011 11:06 AM   in reply to Rob Cole

    Thanks to all.

     

    I don't know either, but I use the subject distance for several things, among them depth of foeld checks to see if I should have stopped down more.  As it stands now I have to pull up LR2.7 to get the distance and it is always there.

     

    Is there a chance this might become the case whrn LR3.3 appears?

     

    Thanks again,

     

    Jack

     
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    Feb 28, 2011 4:06 PM   in reply to Jack II

    I really dunno.

     

    But, ExifMeta3 supports every bit of metadata, including subject/focus-distance and depth-of-field (and hyperfocal distance...)

     
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    Feb 28, 2011 9:12 PM   in reply to Rob Cole

    Thanks for the link to your site.  I'll try the software. 

     

    Jack

     
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