I wrote it up two weeks ago. Since I delete older mail from Gmail, it's gone now. But basically, you have to find what lens name parameter Pentax uses ... LensType, LensID and LensName are all valid tokens. Once you find what Pentax uses, convert the files to DNG, remove the original lens naming token-value, and replace it with a string-based LensName using EXIFtool.
G On Thu, Jan 5, 2012 at 6:40 PM, David Parsons <[email protected]> wrote: > With every update to LR, the lens database changes. Sometimes the > lens information drops out when it was in a previous point release. > Sometimes lens information comes back in. > > On Thu, Jan 5, 2012 at 8:01 PM, Igor Roshchin <[email protected]> wrote: >> >> Actually, I just ran exiftool on a prestine DNG file. >> ( exiftool -a -u -g1 FILENAME ) >> >> It shows: >> >> under section >> ---- Pentax ---- >> Lens Type : PENTAX-F 28-80mm F3.5-4.5 or Sigma or >> Tokina L >> ens >> (actually twice in the same section) >> >> But then, at the bottom, under section >> ---- Composite ---- >> It has: >> Lens ID : Tokina AT-X PRO 28-70mm F2.6-2.8 >> >> Looking into the code of exiftool >> ( file site_perl/5.8.9/Image/ExifTool/TagNames.pod as noted: >> <Image::ExifTool::TagNames/Pentax Tags> ), I found that >> "Composite" tags is something that exiftools calculates based on the >> decoded tags. I didn't look deeper into the code, but I suspect that >> exiftool may go a step further to distinguish which of the 3 lenses it >> is. This would be done probably on such information in EXIF MakerNotes >> as "AE Max Aperture", "Min Aperture", "Lens F Stops", "Nominal Max >> Aperture", "Nominal Min Aperture", etc. - These are different for >> the 3 lenses. >> >> I guess, LR is just not as smart as exiftool is. >> (I just submitted what I think is a feature request on >> feedback.photoshop.com.) >> >> >> Igor >> >> >> >>> Date: Thu, 5 Jan 2012 13:21:23 -0500 (EST) >>> From: Igor Roshchin >>> >>> >>> Thank Jostein, >>> >>> I'll try it, - maybe it will work. >>> My feeling is that the actual code conversion is built in into LR, >>> and it doesn't consult the .lcp file for that, but only uses >>> the .lcp file to match the lens and apply adjustments for it. >>> >>> The list of the lenses is definitely helpful. >>> Here is where the "collision" occurs for me: >>> >>> '3 29' = PENTAX-F 28-80mm F3.5-4.5 or Sigma or Tokina Lens >>> '3 29.1' = Sigma AF 18-125mm F3.5-5.6 DC >>> '3 29.2' = Tokina AT-X PRO 28-70mm F2.6-2.8 >>> >>> It is weird that there are two (!) values corresponding >>> to the same lenses: >>> '3 27' = smc PENTAX-F 28-80mm F3.5-4.5 or Tokina Lens >>> '3 27.1' = Tokina AT-X Pro AF 28-70mm F2.6-2.8 >>> >>> I wonder if the decimal values are actually in the Exif. >>> (I don't know if exiftool actually parses "Makernotes" part of >>> the EXIF, and also whether it can work on DNG files.) >>> >>> As for exiftools solutiona as describe on the Leica forum, - >>> I suspect it is only applicable for the JPEGs, and not for >>> the RAW files: the fields that are being replaced are not in the >>> Makernotes, but in the EXIF parts generated by the converter (LR). >>> >>> >>> Thank you, Jostein for the your interesting thoughts and insightful >>> information. >>> >>> Igor >>> >>> >>> >>> Tue Jan 3 03:54:54 EST 2012 >>> AlunFoto wrote: >>> >>> The lens name is not spelled out in letters inside the image file. >>> It is represented by a numerical code residing in the MakerNotes part >>> of the EXIF. >>> There is a list of codes mapped to names at Phil Harvey's webpages >>> (ExifTools): >>> http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Pentax.html#LensType >>> >>> My hope was that Lightroom could be coaxed to map a code to a different >>> name by providing a lens profile mapping the number to a Tokina name. I >>> imagined you wouldn't have to rename the file or create a separate Tokina >>> folder for it as long as it maps to the name you want for it. >>> >>> The problem of overlapping codes is not unique to Pentax/Tokina, btw. >>> Here's one thread that indicates an issue with Canon/Tamron: >>> http://www.canonrumors.com/forum/index.php?topic=649.15 >>> >>> It could be that your best solution is to use ExifTools directly. Some way >>> down this page there is a recipe for changing lens names for Leica files. >>> Should work for Pentax too, I think. >>> http://www.l-camera-forum.com/leica-forum/digital-post-processing-forum/135236-changing-lens-info-exif.html >>> >>> Hope it can be of some help. >>> Jostein >>> >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. > > > > -- > David Parsons Photography > http://www.davidparsonsphoto.com > > Aloha Photographer Photoblog > http://alohaphotog.blogspot.com/ > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- Godfrey godfreydigiorgi.posterous.com -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
