I've produced vignetting data for the Olympus M.Zuiko Digital ED 12mm f/2.0
lens which appears to work well on real-world images. While I was at it, I
created new TCA correction data, since the existing profile didn't seem to
produce good results for me. I also replaced the distortion correction with a
simpler version that seems to work as well as the existing profile. Because the
TCA correction is substantially different from what was already in the
database, I was hoping for a third opinion before submitting it as a
replacement. Lensfun profile is attached, thanks for any feedback.
--
jys
<lensdatabase version="1">
<lens>
<maker>Olympus</maker>
<model>Olympus M.Zuiko Digital ED 12mm f/2.0</model>
<mount>Micro 4/3 System</mount>
<cropfactor>2</cropfactor>
<aspect-ratio>4:3</aspect-ratio>
<focal value="12" />
<calibration>
<distortion model="ptlens" focal="12" b="-0.028892" />
<tca model="poly3" focal="12" br="0.0000301" vr="1.0003354" bb="0.0000561" vb="0.9999414"/>
<vignetting model="pa" focal="12" aperture="2" distance="10" k1="-0.6818" k2="-0.1021" k3="0.1981"/>
<vignetting model="pa" focal="12" aperture="2" distance="1000" k1="-0.6818" k2="-0.1021" k3="0.1981"/>
<vignetting model="pa" focal="12" aperture="2.8" distance="10" k1="-0.1391" k2="-0.0336" k3="-0.1603"/>
<vignetting model="pa" focal="12" aperture="2.8" distance="1000" k1="-0.1391" k2="-0.0336" k3="-0.1603"/>
<vignetting model="pa" focal="12" aperture="4" distance="10" k1="-0.2327" k2="-0.0190" k3="0.0492"/>
<vignetting model="pa" focal="12" aperture="4" distance="1000" k1="-0.2327" k2="-0.0190" k3="0.0492"/>
<vignetting model="pa" focal="12" aperture="5.6" distance="10" k1="-0.1964" k2="-0.0877" k3="0.0884"/>
<vignetting model="pa" focal="12" aperture="5.6" distance="1000" k1="-0.1964" k2="-0.0877" k3="0.0884"/>
<vignetting model="pa" focal="12" aperture="22" distance="10" k1="-0.2630" k2="0.0244" k3="0.0320"/>
<vignetting model="pa" focal="12" aperture="22" distance="1000" k1="-0.2630" k2="0.0244" k3="0.0320"/>
</calibration>
</lens>
</lensdatabase>
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