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.
