Change LensType for Sigma 105mm F2.8 EX DG Macro

[nobodyknows]

Hi Phil, hi everybody,

unfortunately, my photos shot with a 105mm F2.8 EX DG Macro lens show as LensType and LensID just "Sigma":

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exiftool IMGP0088.JPG "-lens*"
Lens Type                       : Sigma
Lens Focal Length               : 105.0 mm
Lens ID                         : Sigma

and numeric:

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exiftool -n IMGP0088.JPG "-lens*"
Lens Type                       : 3 0
Lens Focal Length               : 105
Lens ID                         : 3 0

The value "3 0" does not correspondent to the values found at https://exiftool.org/TagNames/Sigma.html.
There I find:
0x257   = Sigma 105mm F2.8 EX DG Macro

So I want to change the LensType and LensID to the value 257. I Tried it:

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exiftool IMGP0088.JPG -lenstype=257
    0 image files updated
    1 image files unchanged
exiftool IMGP0088.JPG -lenstype="Sigma 105mm F2.8 EX DG Macro"
    0 image files updated
    1 image files unchanged
exiftool -n IMGP0088.JPG -lenstype=257
    0 image files updated
    1 image files unchanged

The values found in the table are hex values. 0x257 is 500 in decimal. So I tried:

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exiftool -n IMGP0088.JPG -lenstype=599
    0 image files updated
    1 image files unchanged
exiftool IMGP0088.JPG -lenstype=599
    0 image files updated
    1 image files unchanged

Do you have a hint for me how to change the value?

Best regards

Franz

[Phil Harvey]

Hi Franz,

You have left out some crucial information:  The camera make.  I'm assuming Pentax due to the 2-value LensType.  See the Pentax LensType values here.

- Phil

[nobodyknows]

Hi Phil,
thank you for your reply. You are right, it is a Pentax camera. And yes, here I see "3 0" for Sigma.
Hm, my lens is not listed there. So I it is not possible to set LensID and LensType more specific? Then I have do set the tag "Lens" instead.

Best regards

Franz

[Phil Harvey]

Hi Franz,

I suggest using EXIF:LensModel.  This is a string-based tag that will take any value that you write.

- Phil

[nobodyknows]

Thank you, Phil, I will set LensModel.

Franz