Hi all,
The distortion parameters for the Tamron SP 24-70 G2 were wrong for 29
mm zoom; looks like I rarely take photos at that focal length, otherwise
I should have noted this earlier. The erroneous parameters worsened
distortion instead of correcting it. I attach the revised calibration
parameters below (the only change is in the line for distortion at 29 mm).
Cheers,
Martin
====
<lens>
<maker>Tamron</maker>
<!-- The official name of the lens -->
<model>Tamron SP 24-70mm F/2.8 Di VC USD G2 (A032)</model>
<!-- The 'LensIDNumber' EXIF tag - use with old versions of
exiv2 -->
<!-- <model>206</model> -->
<mount>Nikon F AF</mount>
<cropfactor>1</cropfactor>
<calibration>
<distortion model="ptlens" focal="24" a="0.03171"
b="-0.08853" c="0.03481"/>
<distortion model="ptlens" focal="29" a="0.021" b="-0.053"
c="0.019"/>
<distortion model="ptlens" focal="32" a="0.01185"
b="-0.02406" c="0.00346"/>
<distortion model="ptlens" focal="38" a="0.0113"
b="-0.02543" c="0.01625"/>
<distortion model="ptlens" focal="46" a="0.00246"
b="0.00392" c="-0.00871"/>
<distortion model="ptlens" focal="55" a="0.00293"
b="0.00193" c="-0.00236"/>
<distortion model="ptlens" focal="66" a="-0.00224"
b="0.02068" c="-0.02248"/>
<distortion model="ptlens" focal="70" a="0.00297"
b="0.00297" c="-0.004"/>
<tca model="poly3" focal="24" vr="1.0003340" vb="0.9999497"/>
<tca model="poly3" focal="29" vr="1.0003651" vb="0.9998733"/>
<tca model="poly3" focal="32" vr="1.0003268" vb="0.9998101"/>
<tca model="poly3" focal="38" vr="1.0002316" vb="0.9998011"/>
<tca model="poly3" focal="46" vr="1.0001129" vb="0.9997867"/>
<tca model="poly3" focal="55" vr="1.0000077" vb="0.9998272"/>
<tca model="poly3" focal="66" vr="0.9998887" vb="0.9998649"/>
<tca model="poly3" focal="70" vr="0.9998659" vb="0.9998745"/>
<vignetting model="pa" focal="24" aperture="2.8"
distance="10" k1="-0.7353" k2="-0.3358" k3="0.3127"/>
<vignetting model="pa" focal="24" aperture="2.8"
distance="1000" k1="-0.7353" k2="-0.3358" k3="0.3127"/>
<vignetting model="pa" focal="24" aperture="4"
distance="10" k1="-0.9585" k2="0.8746" k3="-0.5299"/>
<vignetting model="pa" focal="24" aperture="4"
distance="1000" k1="-0.9585" k2="0.8746" k3="-0.5299"/>
<vignetting model="pa" focal="24" aperture="5.6"
distance="10" k1="-0.9312" k2="0.6998" k3="-0.2940"/>
<vignetting model="pa" focal="24" aperture="5.6"
distance="1000" k1="-0.9312" k2="0.6998" k3="-0.2940"/>
<vignetting model="pa" focal="24" aperture="8"
distance="10" k1="-0.9264" k2="0.6718" k3="-0.2661"/>
<vignetting model="pa" focal="24" aperture="8"
distance="1000" k1="-0.9264" k2="0.6718" k3="-0.2661"/>
<vignetting model="pa" focal="24" aperture="22"
distance="10" k1="-0.9324" k2="0.6781" k3="-0.2688"/>
<vignetting model="pa" focal="24" aperture="22"
distance="1000" k1="-0.9324" k2="0.6781" k3="-0.2688"/>
<vignetting model="pa" focal="31" aperture="2.8"
distance="10" k1="-0.8093" k2="0.4443" k3="-0.3284"/>
<vignetting model="pa" focal="31" aperture="2.8"
distance="1000" k1="-0.8093" k2="0.4443" k3="-0.3284"/>
<vignetting model="pa" focal="31" aperture="4"
distance="10" k1="-0.8959" k2="0.9608" k3="-0.6089"/>
<vignetting model="pa" focal="31" aperture="4"
distance="1000" k1="-0.8959" k2="0.9608" k3="-0.6089"/>
<vignetting model="pa" focal="31" aperture="5.6"
distance="10" k1="-0.7922" k2="0.5343" k3="-0.2074"/>
<vignetting model="pa" focal="31" aperture="5.6"
distance="1000" k1="-0.7922" k2="0.5343" k3="-0.2074"/>
<vignetting model="pa" focal="31" aperture="8"
distance="10" k1="-0.7902" k2="0.5159" k3="-0.1875"/>
<vignetting model="pa" focal="31" aperture="8"
distance="1000" k1="-0.7902" k2="0.5159" k3="-0.1875"/>
<vignetting model="pa" focal="31" aperture="22"
distance="10" k1="-0.7991" k2="0.5301" k3="-0.1956"/>
<vignetting model="pa" focal="31" aperture="22"
distance="1000" k1="-0.7991" k2="0.5301" k3="-0.1956"/>
<vignetting model="pa" focal="35" aperture="2.8"
distance="10" k1="-0.7706" k2="0.5671" k3="-0.4529"/>
<vignetting model="pa" focal="35" aperture="2.8"
distance="1000" k1="-0.7706" k2="0.5671" k3="-0.4529"/>
<vignetting model="pa" focal="35" aperture="4"
distance="10" k1="-0.7869" k2="0.8146" k3="-0.5135"/>
<vignetting model="pa" focal="35" aperture="4"
distance="1000" k1="-0.7869" k2="0.8146" k3="-0.5135"/>
<vignetting model="pa" focal="35" aperture="5.6"
distance="10" k1="-0.6801" k2="0.3974" k3="-0.1379"/>
<vignetting model="pa" focal="35" aperture="5.6"
distance="1000" k1="-0.6801" k2="0.3974" k3="-0.1379"/>
<vignetting model="pa" focal="35" aperture="8"
distance="10" k1="-0.6829" k2="0.3940" k3="-0.1297"/>
<vignetting model="pa" focal="35" aperture="8"
distance="1000" k1="-0.6829" k2="0.3940" k3="-0.1297"/>
<vignetting model="pa" focal="35" aperture="22"
distance="10" k1="-0.6871" k2="0.3936" k3="-0.1274"/>
<vignetting model="pa" focal="35" aperture="22"
distance="1000" k1="-0.6871" k2="0.3936" k3="-0.1274"/>
<vignetting model="pa" focal="45" aperture="2.8"
distance="10" k1="-0.7319" k2="0.5627" k3="-0.4417"/>
<vignetting model="pa" focal="45" aperture="2.8"
distance="1000" k1="-0.7319" k2="0.5627" k3="-0.4417"/>
<vignetting model="pa" focal="45" aperture="4"
distance="10" k1="-0.6223" k2="0.5431" k3="-0.3315"/>
<vignetting model="pa" focal="45" aperture="4"
distance="1000" k1="-0.6223" k2="0.5431" k3="-0.3315"/>
<vignetting model="pa" focal="45" aperture="5.6"
distance="10" k1="-0.5375" k2="0.2183" k3="-0.0437"/>
<vignetting model="pa" focal="45" aperture="5.6"
distance="1000" k1="-0.5375" k2="0.2183" k3="-0.0437"/>
<vignetting model="pa" focal="45" aperture="8"
distance="10" k1="-0.5497" k2="0.2472" k3="-0.0626"/>
<vignetting model="pa" focal="45" aperture="8"
distance="1000" k1="-0.5497" k2="0.2472" k3="-0.0626"/>
<vignetting model="pa" focal="45" aperture="22"
distance="10" k1="-0.5527" k2="0.2440" k3="-0.0586"/>
<vignetting model="pa" focal="45" aperture="22"
distance="1000" k1="-0.5527" k2="0.2440" k3="-0.0586"/>
<vignetting model="pa" focal="50" aperture="2.8"
distance="10" k1="-0.6891" k2="0.4847" k3="-0.4469"/>
<vignetting model="pa" focal="50" aperture="2.8"
distance="1000" k1="-0.6891" k2="0.4847" k3="-0.4469"/>
<vignetting model="pa" focal="50" aperture="4"
distance="10" k1="-0.6140" k2="0.7127" k3="-0.5379"/>
<vignetting model="pa" focal="50" aperture="4"
distance="1000" k1="-0.6140" k2="0.7127" k3="-0.5379"/>
<vignetting model="pa" focal="50" aperture="5.6"
distance="10" k1="-0.5116" k2="0.2965" k3="-0.1450"/>
<vignetting model="pa" focal="50" aperture="5.6"
distance="1000" k1="-0.5116" k2="0.2965" k3="-0.1450"/>
<vignetting model="pa" focal="50" aperture="8"
distance="10" k1="-0.4777" k2="0.1560" k3="-0.0171"/>
<vignetting model="pa" focal="50" aperture="8"
distance="1000" k1="-0.4777" k2="0.1560" k3="-0.0171"/>
<vignetting model="pa" focal="50" aperture="22"
distance="10" k1="-0.4855" k2="0.1658" k3="-0.0225"/>
<vignetting model="pa" focal="50" aperture="22"
distance="1000" k1="-0.4855" k2="0.1658" k3="-0.0225"/>
<vignetting model="pa" focal="60" aperture="2.8"
distance="10" k1="-0.5333" k2="-0.0788" k3="-0.1139"/>
<vignetting model="pa" focal="60" aperture="2.8"
distance="1000" k1="-0.5333" k2="-0.0788" k3="-0.1139"/>
<vignetting model="pa" focal="60" aperture="4"
distance="10" k1="-0.5424" k2="0.7270" k3="-0.7141"/>
<vignetting model="pa" focal="60" aperture="4"
distance="1000" k1="-0.5424" k2="0.7270" k3="-0.7141"/>
<vignetting model="pa" focal="60" aperture="5.6"
distance="10" k1="-0.5755" k2="0.7550" k3="-0.6229"/>
<vignetting model="pa" focal="60" aperture="5.6"
distance="1000" k1="-0.5755" k2="0.7550" k3="-0.6229"/>
<vignetting model="pa" focal="60" aperture="8"
distance="10" k1="-0.4850" k2="0.3628" k3="-0.2353"/>
<vignetting model="pa" focal="60" aperture="8"
distance="1000" k1="-0.4850" k2="0.3628" k3="-0.2353"/>
<vignetting model="pa" focal="60" aperture="22"
distance="10" k1="-0.4263" k2="0.1109" k3="-0.0046"/>
<vignetting model="pa" focal="60" aperture="22"
distance="1000" k1="-0.4263" k2="0.1109" k3="-0.0046"/>
<vignetting model="pa" focal="70" aperture="2.8"
distance="10" k1="-0.6878" k2="0.2182" k3="-0.2304"/>
<vignetting model="pa" focal="70" aperture="2.8"
distance="1000" k1="-0.6878" k2="0.2182" k3="-0.2304"/>
<vignetting model="pa" focal="70" aperture="4"
distance="10" k1="-0.4472" k2="0.5440" k3="-0.5921"/>
<vignetting model="pa" focal="70" aperture="4"
distance="1000" k1="-0.4472" k2="0.5440" k3="-0.5921"/>
<vignetting model="pa" focal="70" aperture="5.6"
distance="10" k1="-0.4902" k2="0.5962" k3="-0.5018"/>
<vignetting model="pa" focal="70" aperture="5.6"
distance="1000" k1="-0.4902" k2="0.5962" k3="-0.5018"/>
<vignetting model="pa" focal="70" aperture="8"
distance="10" k1="-0.3866" k2="0.1643" k3="-0.0834"/>
<vignetting model="pa" focal="70" aperture="8"
distance="1000" k1="-0.3866" k2="0.1643" k3="-0.0834"/>
<vignetting model="pa" focal="70" aperture="22"
distance="10" k1="-0.3623" k2="0.0485" k3="0.0246"/>
<vignetting model="pa" focal="70" aperture="22"
distance="1000" k1="-0.3623" k2="0.0485" k3="0.0246"/>
</calibration>
</lens>
Am 27.09.2018 um 23:17 schrieb Graeme Leese:
Hi Martin,
Thanks for the data, that looks great. I'll add it to the database,
it'll be reviewed and it should be included in the next release.
Thanks,
Graeme
On Fri, 21 Sep 2018 at 18:13, Martin Kunz <martin...@gmx.de
<mailto:martin...@gmx.de>> wrote:
Hi,
I followed [1] to calibrate my Tamron SP 24-70mm F/2.8 Di VC USD
G2 and
get good results in darktable. The calibration parameters are attached
below.
Thanks for developing the helpful lensfun library!
Cheers,
Martin
[1] https://wilson.bronger.org/lens_calibration_tutorial/#id3
====
<lens>
<maker>Tamron</maker>
<!-- The official name of the lens -->
<model>Tamron SP 24-70mm F/2.8 Di VC USD G2 (A032)</model>
<!-- The 'LensIDNumber' EXIF tag - use with old versions of
exiv2 -->
<!--- <model>206</model> -->
<mount>Nikon F AF</mount>
<cropfactor>1</cropfactor>
<calibration>
<distortion model="ptlens" focal="24" a="0.03171"
b="-0.08853" c="0.03481"/>
<distortion model="ptlens" focal="29" a="0.0162"
b="-0.07314" c="-0.06455"/>
<distortion model="ptlens" focal="32" a="0.01185"
b="-0.02406" c="0.00346"/>
<distortion model="ptlens" focal="38" a="0.0113"
b="-0.02543" c="0.01625"/>
<distortion model="ptlens" focal="46" a="0.00246"
b="0.00392" c="-0.00871"/>
<distortion model="ptlens" focal="55" a="0.00293"
b="0.00193" c="-0.00236"/>
<distortion model="ptlens" focal="66" a="-0.00224"
b="0.02068" c="-0.02248"/>
<distortion model="ptlens" focal="70" a="0.00297"
b="0.00297" c="-0.004"/>
<tca model="poly3" focal="24" vr="1.0003340"
vb="0.9999497"/>
<tca model="poly3" focal="29" vr="1.0003651"
vb="0.9998733"/>
<tca model="poly3" focal="32" vr="1.0003268"
vb="0.9998101"/>
<tca model="poly3" focal="38" vr="1.0002316"
vb="0.9998011"/>
<tca model="poly3" focal="46" vr="1.0001129"
vb="0.9997867"/>
<tca model="poly3" focal="55" vr="1.0000077"
vb="0.9998272"/>
<tca model="poly3" focal="66" vr="0.9998887"
vb="0.9998649"/>
<tca model="poly3" focal="70" vr="0.9998659"
vb="0.9998745"/>
<vignetting model="pa" focal="24" aperture="2.8"
distance="10" k1="-0.7353" k2="-0.3358" k3="0.3127"/>
<vignetting model="pa" focal="24" aperture="2.8"
distance="1000" k1="-0.7353" k2="-0.3358" k3="0.3127"/>
<vignetting model="pa" focal="24" aperture="4"
distance="10"
k1="-0.9585" k2="0.8746" k3="-0.5299"/>
<vignetting model="pa" focal="24" aperture="4"
distance="1000" k1="-0.9585" k2="0.8746" k3="-0.5299"/>
<vignetting model="pa" focal="24" aperture="5.6"
distance="10" k1="-0.9312" k2="0.6998" k3="-0.2940"/>
<vignetting model="pa" focal="24" aperture="5.6"
distance="1000" k1="-0.9312" k2="0.6998" k3="-0.2940"/>
<vignetting model="pa" focal="24" aperture="8"
distance="10"
k1="-0.9264" k2="0.6718" k3="-0.2661"/>
<vignetting model="pa" focal="24" aperture="8"
distance="1000" k1="-0.9264" k2="0.6718" k3="-0.2661"/>
<vignetting model="pa" focal="24" aperture="22"
distance="10" k1="-0.9324" k2="0.6781" k3="-0.2688"/>
<vignetting model="pa" focal="24" aperture="22"
distance="1000" k1="-0.9324" k2="0.6781" k3="-0.2688"/>
<vignetting model="pa" focal="31" aperture="2.8"
distance="10" k1="-0.8093" k2="0.4443" k3="-0.3284"/>
<vignetting model="pa" focal="31" aperture="2.8"
distance="1000" k1="-0.8093" k2="0.4443" k3="-0.3284"/>
<vignetting model="pa" focal="31" aperture="4"
distance="10"
k1="-0.8959" k2="0.9608" k3="-0.6089"/>
<vignetting model="pa" focal="31" aperture="4"
distance="1000" k1="-0.8959" k2="0.9608" k3="-0.6089"/>
<vignetting model="pa" focal="31" aperture="5.6"
distance="10" k1="-0.7922" k2="0.5343" k3="-0.2074"/>
<vignetting model="pa" focal="31" aperture="5.6"
distance="1000" k1="-0.7922" k2="0.5343" k3="-0.2074"/>
<vignetting model="pa" focal="31" aperture="8"
distance="10"
k1="-0.7902" k2="0.5159" k3="-0.1875"/>
<vignetting model="pa" focal="31" aperture="8"
distance="1000" k1="-0.7902" k2="0.5159" k3="-0.1875"/>
<vignetting model="pa" focal="31" aperture="22"
distance="10" k1="-0.7991" k2="0.5301" k3="-0.1956"/>
<vignetting model="pa" focal="31" aperture="22"
distance="1000" k1="-0.7991" k2="0.5301" k3="-0.1956"/>
<vignetting model="pa" focal="35" aperture="2.8"
distance="10" k1="-0.7706" k2="0.5671" k3="-0.4529"/>
<vignetting model="pa" focal="35" aperture="2.8"
distance="1000" k1="-0.7706" k2="0.5671" k3="-0.4529"/>
<vignetting model="pa" focal="35" aperture="4"
distance="10"
k1="-0.7869" k2="0.8146" k3="-0.5135"/>
<vignetting model="pa" focal="35" aperture="4"
distance="1000" k1="-0.7869" k2="0.8146" k3="-0.5135"/>
<vignetting model="pa" focal="35" aperture="5.6"
distance="10" k1="-0.6801" k2="0.3974" k3="-0.1379"/>
<vignetting model="pa" focal="35" aperture="5.6"
distance="1000" k1="-0.6801" k2="0.3974" k3="-0.1379"/>
<vignetting model="pa" focal="35" aperture="8"
distance="10"
k1="-0.6829" k2="0.3940" k3="-0.1297"/>
<vignetting model="pa" focal="35" aperture="8"
distance="1000" k1="-0.6829" k2="0.3940" k3="-0.1297"/>
<vignetting model="pa" focal="35" aperture="22"
distance="10" k1="-0.6871" k2="0.3936" k3="-0.1274"/>
<vignetting model="pa" focal="35" aperture="22"
distance="1000" k1="-0.6871" k2="0.3936" k3="-0.1274"/>
<vignetting model="pa" focal="45" aperture="2.8"
distance="10" k1="-0.7319" k2="0.5627" k3="-0.4417"/>
<vignetting model="pa" focal="45" aperture="2.8"
distance="1000" k1="-0.7319" k2="0.5627" k3="-0.4417"/>
<vignetting model="pa" focal="45" aperture="4"
distance="10"
k1="-0.6223" k2="0.5431" k3="-0.3315"/>
<vignetting model="pa" focal="45" aperture="4"
distance="1000" k1="-0.6223" k2="0.5431" k3="-0.3315"/>
<vignetting model="pa" focal="45" aperture="5.6"
distance="10" k1="-0.5375" k2="0.2183" k3="-0.0437"/>
<vignetting model="pa" focal="45" aperture="5.6"
distance="1000" k1="-0.5375" k2="0.2183" k3="-0.0437"/>
<vignetting model="pa" focal="45" aperture="8"
distance="10"
k1="-0.5497" k2="0.2472" k3="-0.0626"/>
<vignetting model="pa" focal="45" aperture="8"
distance="1000" k1="-0.5497" k2="0.2472" k3="-0.0626"/>
<vignetting model="pa" focal="45" aperture="22"
distance="10" k1="-0.5527" k2="0.2440" k3="-0.0586"/>
<vignetting model="pa" focal="45" aperture="22"
distance="1000" k1="-0.5527" k2="0.2440" k3="-0.0586"/>
<vignetting model="pa" focal="50" aperture="2.8"
distance="10" k1="-0.6891" k2="0.4847" k3="-0.4469"/>
<vignetting model="pa" focal="50" aperture="2.8"
distance="1000" k1="-0.6891" k2="0.4847" k3="-0.4469"/>
<vignetting model="pa" focal="50" aperture="4"
distance="10"
k1="-0.6140" k2="0.7127" k3="-0.5379"/>
<vignetting model="pa" focal="50" aperture="4"
distance="1000" k1="-0.6140" k2="0.7127" k3="-0.5379"/>
<vignetting model="pa" focal="50" aperture="5.6"
distance="10" k1="-0.5116" k2="0.2965" k3="-0.1450"/>
<vignetting model="pa" focal="50" aperture="5.6"
distance="1000" k1="-0.5116" k2="0.2965" k3="-0.1450"/>
<vignetting model="pa" focal="50" aperture="8"
distance="10"
k1="-0.4777" k2="0.1560" k3="-0.0171"/>
<vignetting model="pa" focal="50" aperture="8"
distance="1000" k1="-0.4777" k2="0.1560" k3="-0.0171"/>
<vignetting model="pa" focal="50" aperture="22"
distance="10" k1="-0.4855" k2="0.1658" k3="-0.0225"/>
<vignetting model="pa" focal="50" aperture="22"
distance="1000" k1="-0.4855" k2="0.1658" k3="-0.0225"/>
<vignetting model="pa" focal="60" aperture="2.8"
distance="10" k1="-0.5333" k2="-0.0788" k3="-0.1139"/>
<vignetting model="pa" focal="60" aperture="2.8"
distance="1000" k1="-0.5333" k2="-0.0788" k3="-0.1139"/>
<vignetting model="pa" focal="60" aperture="4"
distance="10"
k1="-0.5424" k2="0.7270" k3="-0.7141"/>
<vignetting model="pa" focal="60" aperture="4"
distance="1000" k1="-0.5424" k2="0.7270" k3="-0.7141"/>
<vignetting model="pa" focal="60" aperture="5.6"
distance="10" k1="-0.5755" k2="0.7550" k3="-0.6229"/>
<vignetting model="pa" focal="60" aperture="5.6"
distance="1000" k1="-0.5755" k2="0.7550" k3="-0.6229"/>
<vignetting model="pa" focal="60" aperture="8"
distance="10"
k1="-0.4850" k2="0.3628" k3="-0.2353"/>
<vignetting model="pa" focal="60" aperture="8"
distance="1000" k1="-0.4850" k2="0.3628" k3="-0.2353"/>
<vignetting model="pa" focal="60" aperture="22"
distance="10" k1="-0.4263" k2="0.1109" k3="-0.0046"/>
<vignetting model="pa" focal="60" aperture="22"
distance="1000" k1="-0.4263" k2="0.1109" k3="-0.0046"/>
<vignetting model="pa" focal="70" aperture="2.8"
distance="10" k1="-0.6878" k2="0.2182" k3="-0.2304"/>
<vignetting model="pa" focal="70" aperture="2.8"
distance="1000" k1="-0.6878" k2="0.2182" k3="-0.2304"/>
<vignetting model="pa" focal="70" aperture="4"
distance="10"
k1="-0.4472" k2="0.5440" k3="-0.5921"/>
<vignetting model="pa" focal="70" aperture="4"
distance="1000" k1="-0.4472" k2="0.5440" k3="-0.5921"/>
<vignetting model="pa" focal="70" aperture="5.6"
distance="10" k1="-0.4902" k2="0.5962" k3="-0.5018"/>
<vignetting model="pa" focal="70" aperture="5.6"
distance="1000" k1="-0.4902" k2="0.5962" k3="-0.5018"/>
<vignetting model="pa" focal="70" aperture="8"
distance="10"
k1="-0.3866" k2="0.1643" k3="-0.0834"/>
<vignetting model="pa" focal="70" aperture="8"
distance="1000" k1="-0.3866" k2="0.1643" k3="-0.0834"/>
<vignetting model="pa" focal="70" aperture="22"
distance="10" k1="-0.3623" k2="0.0485" k3="0.0246"/>
<vignetting model="pa" focal="70" aperture="22"
distance="1000" k1="-0.3623" k2="0.0485" k3="0.0246"/>
</calibration>
</lens>
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