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Robin Mills, 06 Aug 2018 04:34


Lens Recognition in Exiv2 v026 (and later)

I've given up on lens recognition. Manufacturers use the same lensID for more than one lens. This is discussed here: http://dev.exiv2.org/issues/1212

On the trunk and v0.26, you can add your lens to the file ~/.exiv2. You need to know your lensID

636 rmills@rmillsmbp:~/gnu/exiv2/trunk $ exiv2 -pv --grep lens/i ~/Stonehenge.jpg 
0x0083 Nikon3       LensType                    Byte        1  14    
0x0084 Nikon3       Lens                        Rational    4  180/10 2500/10 35/10 63/10
0x008b Nikon3       LensFStops                  Undefined   4  55 1 12 0
0x000c NikonLd3     LensIDNumber                Byte        1  146 <--- This number
0x000d NikonLd3     LensFStops                  Byte        1  55
637 rmills@rmillsmbp:~/gnu/exiv2/trunk $ 
Put it into ~/.exiv2 (or c:\Users\username\exiv2.ini on MSVC/MinGW builds).
637 rmills@rmillsmbp:~/gnu/exiv2/trunk $ cat ~/.exiv2 
[nikon]
146=Robin's Sigma Lens  <--- The name of your lens

638 rmills@rmillsmbp:~/gnu/exiv2/trunk $ 
Now your lens will be recognised.
638 rmills@rmillsmbp:~/gnu/exiv2/trunk $ exiv2 -pa --grep lens/i ~/Stonehenge.jpg 
Exif.Nikon3.LensType                         Byte        1  D G VR
Exif.Nikon3.Lens                             Rational    4  18-250mm F3.5-6.3
Exif.Nikon3.LensFStops                       Undefined   4  4.58333
Exif.NikonLd3.LensIDNumber                   Byte        1  Robin's Sigma Lens  <--- Will be reported
Exif.NikonLd3.LensFStops                     Byte        1  F4.6
638 rmills@rmillsmbp:~/gnu/exiv2/trunk $ 

Location of the Config File

Windows:

C:\WINDOWS\system32>exiv2 -vVg config
exiv2 0.25 001900 (32 bit build)
config_path=C:\Users\rmills\exiv2.ini

Cygwin:

501 rmills@rmillsmbp-w7:~ $ exiv2 -vVg config
exiv2 0.26 001a00 (64 bit build)
config_path=/home/rmills/.exiv2
502 rmills@rmillsmbp-w7:~ $ cygpath -aw /home/rmills/.exiv2
C:\cygwin64\home\rmills\.exiv2
503 rmills@rmillsmbp-w7:~ $

MinGW:

412 -32- /c/temp/dist/mingw/bin> ./exiv2 -vVg config
exiv2 0.26 001a00 (32 bit build)
config_path=C:\Users\rmills\exiv2.ini
413 -32- /c/temp/dist/mingw/bin>

MacOS-X:

530 rmills@rmillsmbp:~/gnu/github/exiv2/exiv2 $ exiv2 -vV --grep config
exiv2 0.26 001a00 (64 bit build)
library=/usr/lib/system/libsystem_configuration.dylib
config_path=/Users/rmills/.exiv2
531 rmills@rmillsmbp:~/gnu/github/exiv2/exiv2 $ 

Linux:

2019 rmills@ubuntu:~/gnu/github/exiv2/exiv2/build $ bin/exiv2 -vVg config
exiv2 0.26 001a00 (64 bit build)
config_path=/home/rmills/.exiv2
2020 rmills@ubuntu:~/gnu/github/exiv2/exiv2/build $ 

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