Trying to extract the crop factor (or other lens- or camera-specific
information) from the EXIF data can be straightforward, but it may as
well be difficult or impossible, depending on the work flow.
I have had my issue with the lens data, where I couldn't get enough
EXIF information into the images to make hugin detect that I was using
a stereographic lens. My proposition was to use the information in the
EXIF tag 'LensModel' to pick a specific lens .ini file. Since
properties like the crop factor are gleaned from the lens .ini file,
this would solve the issue. It seems my proposal hasn't elicited any
interest whatsover, though :(     - have a look at

http://groups.google.com/group/hugin-ptx/browse_thread/thread/cf6bba0d7babb4a5#

(I hope that's the right way to refer to another thread - In case it's
not, the heading is
'feature proposal: let hugin use the LensModel EXIF tag')

with regards
KFJ

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