Hi Chris,
You can also substitute the -s option in the case of hdrgen (not Photosphere,
though). This sets the exposure multiplier explicitly. You can estimate this
from the known camera parameters using:
Kfactor = 87.;
stonits = Kfactor * aperture*aperture / (exptime * asa);
where aperture is in f-stops and exptime is in seconds.
That way, you don't need exiftool. Usually the only information missing is the
ASA, and this can usually be solved by choosing an ASA that is 1 EV higher.
Cheers,
-Greg
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