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


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