HowTo? Preset for specific lens?

[l_d_allan]

I've found ExifToolGui very useful. Thanks for developing, maintaining, and supporting it.

At least so far, my only "use case" is supplying the missing EXIF for a fully manual Samyang 14mm f2.8 lens.
LensModel: Samyang 14mm f2.8
FNumber: Usually f5.6
FocalLength: 14mm (incorrectly reported as 50mm for some reason)

Is there a way to have a simple preset to fill-in this information for some/most/all files in a directory with minimal mouse/key-strokes?

Sorry if this has been asked before, or I missed a way to accomplish this.

[scharott]

the subject and question is some days ago, but I think it is interesting some people.

If you use a full manually lens, then the most cameras need the "MAN"-Programm or the offer an option "using without lens".
Because there is no RAM-Chip in the lens, from there comes no information about them.

In other cases you'll use an "AF-confirm-Chip-Adapter" for the lens. There is a little chip, which simulates a lens (most 50 mm and f/1,4).
The camera thinks, there is an lens and starts some functions.

You can use exiftoolGUI to change the tag contents.  There is an example of my ARGs-File which I use for an manually 8-mm Fisheye. It comes with an AF-Confirm-Chip with focal-length 8mm, f/1.4 and LensType 25811 --  but  the true max aperture is f/3.5

#   21-11-2012  SAMYANG 8mm  f/3.5
#
   -ExifIFD:UserComment=Peleng 8mm-Fisheye F3,5-F16
   -ExifIFD:LensInfo=8/1 8/1 35/10 35/10
   -ExifIFD:LensModel=8mm F3,5 (Peleng-Fisheye)
   -ExifIFD:MaxApertureValue#=3.50300670606376
   -ExifIFD:FNumber#=3.5
#   -ExifIFD:FocalLength#=8
#   -ExifIFD:FocalLengthIn35mmFormat#=12
#   -Sony:LensType#=25811
   -Sony:LensSpec#=01 8 0 3.5 0 02
   -Sony:ApertureSetting#=3.50300670606376
   -xmp:LensManufacturer=Peleng Fisheye
   -xmp:Lens=8mm F3,5 (Peleng-Fisheye)
#   -xmp:LensID#=25811
   -xmp:LensInfo=8/1 8/1 35/10 35/10
   -DNGLensInfo=8/1 8/1 35/10 35/10
#
# Artist-info
   -XMP:Creator= yourname
   -Exif:Artist= yourname
   -XMP:Rights= yourname

----------------
I've added the start-function to this (and some other) ARGs-File into the ini-file
The command line can find by "IF...." any file with the LensID "25811"

[ETdirectCmd]
Peleng   8mm-Fisheye F3.5     ID25811=-if "$lensID# eq 25811" -@ ARG_PELENG_8mm.args

-----------------
Hope, this may help some Newbee"

scharott