Hello All,
I have a new camera and lens (Pentax K30-Sigma 18-200), and have been
testing a few things.
I find that Lensfun has two entries for this lens, I guess from different
contributors.
If I do a stitch without using lensfun calibration, I get a max. error of
2.8 pix.
If I stitch using lensfun lens A, I get a max. error of 2.6 pix.
With lensfun lens B, I get a max. error of 3.75 pix.
I guess the errors are reasonable in all cases, but would one expect that
sort of variation between lenses, assuming the calibration has been done
properly?
Following on the above results, I thought it might be enlightening to do
my my own lensfun calibration for this lens.
Reading the tutorial, the vignetting calibration looks a bit 'serious'...
for each focal length
for each aperture
for each distance
As I probably have about 7 focal lengths for this lens, and ?? apertures,
the cases start to mount up.
Is it really necessary to cover so many cases, or can hugin get by with a
smaller sample?
Finally, what units is 'distance' in the lensfun database...I can't find a
definition anywhere. I assume it is metres, but that could be wrong.
Cheers,
--
Regards,
Terry Duell
--
You received this message because you are subscribed to the Google Groups "Hugin and
other free panoramic software" group.
A list of frequently asked questions is available at:
http://wiki.panotools.org/Hugin_FAQ
To post to this group, send email to hugin-ptx@googlegroups.com
To unsubscribe from this group, send email to
hugin-ptx+unsubscr...@googlegroups.com
For more options, visit this group at http://groups.google.com/group/hugin-ptx
