Hi all,
I have attached a calibration file for the Nikon 16-80 mm lens. I followed
Torsten's tutorial here:
http://wilson.bronger.org/lens_calibration_tutorial/.
The one issue I see is with the vignetting correction, it seems to
over-correct a ring between the center and the corners. The amount of
overcorrection is small. I measured it by taking the image into my raw
editor (darktable), turning on lens correction, and boosting the exposure
until the clipping indicators appeared (in a ring around the center). I
then turned off correction (the clipping indicators went away), and boosted
the exposure until I saw clipping again (this time in the center).
The difference between these two exposures was at most 0.14 EV (at 16 mm,
where the strongest vignetting is). At longer focal lengths the difference
drops to 0.03-0.08. Probably not enough to worry about, and certainly
better than the 2+ stops of original vignetting.
Let me know if there is anything else I should submit, or if there is
somewhere else I should upload the file for inclusion in the database.
-Owen
<lensdatabase>
<lens>
<maker>Nikon</maker>
<model>Nikon AF-S DX Nikkor 16-80mm f/2.8-4.0E ED VR</model>
<mount>Nikon F AF</mount>
<cropfactor>1.523</cropfactor>
<calibration>
<distortion model="ptlens" focal="16" a="0.021339" b="-0.061094" c="0.010731" />
<distortion model="ptlens" focal="25" a="0.017486" b="-.043151" c=".041034" />
<distortion model="ptlens" focal="38" a="0.013721" b="-0.030792" c="0.044097" />
<distortion model="ptlens" focal="50" a="0.012231" b="-0.022785" c="0.022944" />
<distortion model="ptlens" focal="80" a="0.007743" b="-0.022278" c="0.044335" />
<tca model="poly3" focal="16" br="-0.0000411" vr="1.0004024" bb="0.0000383" vb="0.9999716" />
<tca model="poly3" focal="16" br="-0.0000753" vr="1.0003986" bb="0.0000538" vb="0.9999754" />
<tca model="poly3" focal="16" br="-0.0001075" vr="1.0003948" bb="0.0000649" vb="0.9999906" />
<tca model="poly3" focal="24" br="-0.0000360" vr="1.0001751" bb="0.0000671" vb="0.9999619" />
<tca model="poly3" focal="25" br="-0.0000500" vr="1.0002395" bb="0.0000739" vb="0.9999166" />
<tca model="poly3" focal="25" br="-0.0000576" vr="1.0002547" bb="0.0000501" vb="0.9999452" />
<tca model="poly3" focal="35" br="-0.0000464" vr="1.0001052" bb="0.0000301" vb="0.9999806" />
<tca model="poly3" focal="35" br="-0.0000598" vr="1.0001281" bb="0.0000374" vb="0.9999830" />
<tca model="poly3" focal="38" br="-0.0000213" vr="1.0000390" bb="-0.0000091" vb="1.0000303" />
<tca model="poly3" focal="50" br="0.0000022" vr="0.9998829" bb="-0.0000146" vb="0.9999875" />
<tca model="poly3" focal="50" br="0.0000261" vr="0.9999008" bb="-0.0000317" vb="0.9999776" />
<tca model="poly3" focal="80" br="-0.0000238" vr="0.9997903" bb="-0.0000055" vb="0.9998115" />
<tca model="poly3" focal="80" br="-0.0000767" vr="0.9997550" bb="-0.0000107" vb="0.9998579" />
<vignetting model="pa" focal="16" aperture="2.8" distance="0.35" k1="-0.8839" k2="0.3654" k3="-0.2446" />
<vignetting model="pa" focal="16" aperture="2.8" distance="0.8" k1="-0.9376" k2="0.5401" k3="-0.3379" />
<vignetting model="pa" focal="16" aperture="2.8" distance="2.99" k1="-1.0385" k2="0.8115" k3="-0.5029" />
<vignetting model="pa" focal="16" aperture="2.8" distance="1000" k1="-0.8988" k2="0.4834" k3="-0.2968" />
<vignetting model="pa" focal="16" aperture="4" distance="0.35" k1="-0.5092" k2="0.2886" k3="-0.3686" />
<vignetting model="pa" focal="16" aperture="4" distance="0.8" k1="-0.4627" k2="0.1615" k3="-0.2543" />
<vignetting model="pa" focal="16" aperture="4" distance="2.99" k1="-0.5547" k2="0.3727" k3="-0.3579" />
<vignetting model="pa" focal="16" aperture="4" distance="1000" k1="-0.4080" k2="0.0320" k3="-0.1436" />
<vignetting model="pa" focal="16" aperture="5.6" distance="0.35" k1="-0.4849" k2="0.0920" k3="-0.0481" />
<vignetting model="pa" focal="16" aperture="5.6" distance="0.8" k1="-0.5084" k2="0.1712" k3="-0.0831" />
<vignetting model="pa" focal="16" aperture="5.6" distance="2.99" k1="-0.5147" k2="0.1494" k3="-0.0429" />
<vignetting model="pa" focal="16" aperture="5.6" distance="1000" k1="-0.4259" k2="-0.0384" k3="0.0656" />
<vignetting model="pa" focal="16" aperture="8" distance="0.35" k1="-0.4684" k2="0.0017" k3="0.0394" />
<vignetting model="pa" focal="16" aperture="8" distance="0.8" k1="-0.5063" k2="0.1195" k3="-0.0245" />
<vignetting model="pa" focal="16" aperture="8" distance="2.99" k1="-0.5173" k2="0.1450" k3="-0.0347" />
<vignetting model="pa" focal="16" aperture="8" distance="1000" k1="-0.4280" k2="-0.0421" k3="0.0719" />
<vignetting model="pa" focal="16" aperture="22" distance="0.35" k1="-0.5203" k2="0.1335" k3="-0.0444" />
<vignetting model="pa" focal="16" aperture="22" distance="0.8" k1="-0.5595" k2="0.2428" k3="-0.1004" />
<vignetting model="pa" focal="16" aperture="22" distance="2.99" k1="-0.5695" k2="0.2751" k3="-0.1178" />
<vignetting model="pa" focal="16" aperture="22" distance="1000" k1="-0.4935" k2="0.1180" k3="-0.0263" />
<vignetting model="pa" focal="25" aperture="3" distance="0.35" k1="-1.0433" k2="1.0169" k3="-0.4565" />
<vignetting model="pa" focal="25" aperture="3" distance="0.8" k1="-1.0472" k2="1.0773" k3="-0.5258" />
<vignetting model="pa" focal="25" aperture="3" distance="2.99" k1="-1.0578" k2="1.1454" k3="-0.5951" />
<vignetting model="pa" focal="25" aperture="3" distance="1000" k1="-1.0880" k2="1.2529" k3="-0.6837" />
<vignetting model="pa" focal="25" aperture="4" distance="0.35" k1="-0.3623" k2="-0.1243" k3="0.1207" />
<vignetting model="pa" focal="25" aperture="4" distance="0.8" k1="-0.3568" k2="-0.1078" k3="0.0943" />
<vignetting model="pa" focal="25" aperture="4" distance="2.99" k1="-0.3464" k2="-0.1200" k3="0.1081" />
<vignetting model="pa" focal="25" aperture="4" distance="1000" k1="-0.3536" k2="-0.0855" k3="0.0717" />
<vignetting model="pa" focal="25" aperture="5.6" distance="0.35" k1="-0.4511" k2="0.2230" k3="-0.0787" />
<vignetting model="pa" focal="25" aperture="5.6" distance="0.8" k1="-0.4283" k2="0.1752" k3="-0.0452" />
<vignetting model="pa" focal="25" aperture="5.6" distance="2.99" k1="-0.4228" k2="0.1805" k3="-0.0530" />
<vignetting model="pa" focal="25" aperture="5.6" distance="1000" k1="-0.4412" k2="0.2474" k3="-0.1082" />
<vignetting model="pa" focal="25" aperture="8" distance="0.35" k1="-0.4491" k2="0.2040" k3="-0.0568" />
<vignetting model="pa" focal="25" aperture="8" distance="0.8" k1="-0.4269" k2="0.1685" k3="-0.0349" />
<vignetting model="pa" focal="25" aperture="8" distance="2.99" k1="-0.4240" k2="0.1764" k3="-0.0451" />
<vignetting model="pa" focal="25" aperture="8" distance="1000" k1="-0.4397" k2="0.2257" k3="-0.0872" />
<vignetting model="pa" focal="25" aperture="24" distance="0.35" k1="-0.4458" k2="0.1920" k3="-0.0424" />
<vignetting model="pa" focal="25" aperture="24" distance="0.8" k1="-0.4254" k2="0.1645" k3="-0.0261" />
<vignetting model="pa" focal="25" aperture="24" distance="2.99" k1="-0.4206" k2="0.1711" k3="-0.0336" />
<vignetting model="pa" focal="26" aperture="3" distance="0.35" k1="-1.0181" k2="0.9499" k3="-0.4015" />
<vignetting model="pa" focal="26" aperture="3" distance="0.8" k1="-1.0192" k2="1.0317" k3="-0.4985" />
<vignetting model="pa" focal="26" aperture="3" distance="2.99" k1="-1.0278" k2="1.0921" k3="-0.5614" />
<vignetting model="pa" focal="26" aperture="3" distance="1000" k1="-1.0801" k2="1.2372" k3="-0.6679" />
<vignetting model="pa" focal="26" aperture="4" distance="0.35" k1="-0.3474" k2="-0.1357" k3="0.1202" />
<vignetting model="pa" focal="26" aperture="4" distance="0.8" k1="-0.3232" k2="-0.1514" k3="0.1159" />
<vignetting model="pa" focal="26" aperture="4" distance="2.99" k1="-0.2914" k2="-0.2438" k3="0.1850" />
<vignetting model="pa" focal="26" aperture="4" distance="1000" k1="-0.3374" k2="-0.1311" k3="0.1110" />
<vignetting model="pa" focal="26" aperture="5.6" distance="0.35" k1="-0.4423" k2="0.2154" k3="-0.0635" />
<vignetting model="pa" focal="26" aperture="5.6" distance="0.8" k1="-0.4124" k2="0.1678" k3="-0.0399" />
<vignetting model="pa" focal="26" aperture="5.6" distance="2.99" k1="-0.4029" k2="0.1511" k3="-0.0309" />
<vignetting model="pa" focal="26" aperture="5.6" distance="1000" k1="-0.4374" k2="0.2245" k3="-0.0718" />
<vignetting model="pa" focal="26" aperture="8" distance="0.35" k1="-0.4443" k2="0.2155" k3="-0.0645" />
<vignetting model="pa" focal="26" aperture="8" distance="0.8" k1="-0.4167" k2="0.1714" k3="-0.0431" />
<vignetting model="pa" focal="26" aperture="8" distance="2.99" k1="-0.4054" k2="0.1469" k3="-0.0267" />
<vignetting model="pa" focal="26" aperture="8" distance="1000" k1="-0.4430" k2="0.2364" k3="-0.0824" />
<vignetting model="pa" focal="26" aperture="24" distance="0.35" k1="-0.4295" k2="0.1579" k3="-0.0210" />
<vignetting model="pa" focal="26" aperture="24" distance="0.8" k1="-0.4014" k2="0.1108" k3="0.0059" />
<vignetting model="pa" focal="26" aperture="24" distance="2.99" k1="-0.3909" k2="0.0908" k3="0.0174" />
<vignetting model="pa" focal="26" aperture="24" distance="1000" k1="-0.4206" k2="0.1579" k3="-0.0225" />
<vignetting model="pa" focal="38" aperture="3.3" distance="0.35" k1="-0.9194" k2="0.9594" k3="-0.4877" />
<vignetting model="pa" focal="38" aperture="3.3" distance="0.8" k1="-0.9355" k2="1.1463" k3="-0.7162" />
<vignetting model="pa" focal="38" aperture="3.3" distance="2.99" k1="-0.9188" k2="1.1454" k3="-0.7483" />
<vignetting model="pa" focal="38" aperture="3.3" distance="1000" k1="-0.9856" k2="1.2859" k3="-0.8395" />
<vignetting model="pa" focal="38" aperture="4.5" distance="0.35" k1="-0.2415" k2="-0.1767" k3="0.1105" />
<vignetting model="pa" focal="38" aperture="4.5" distance="2.99" k1="-0.2367" k2="-0.1219" k3="0.0279" />
<vignetting model="pa" focal="38" aperture="4.5" distance="1000" k1="-0.1952" k2="-0.2001" k3="0.0524" />
<vignetting model="pa" focal="38" aperture="5" distance="0.35" k1="-0.3175" k2="0.1703" k3="-0.1231" />
<vignetting model="pa" focal="38" aperture="5" distance="0.8" k1="-0.1796" k2="-0.1250" k3="0.0402" />
<vignetting model="pa" focal="38" aperture="5" distance="2.99" k1="-0.2587" k2="0.1200" k3="-0.1066" />
<vignetting model="pa" focal="38" aperture="6.3" distance="0.35" k1="-0.3499" k2="0.2404" k3="-0.1221" />
<vignetting model="pa" focal="38" aperture="6.3" distance="2.99" k1="-0.3043" k2="0.1045" k3="-0.0209" />
<vignetting model="pa" focal="38" aperture="6.3" distance="1000" k1="-0.2494" k2="-0.0096" k3="0.0475" />
<vignetting model="pa" focal="38" aperture="7.1" distance="0.35" k1="-0.3255" k2="0.1420" k3="-0.0413" />
<vignetting model="pa" focal="38" aperture="7.1" distance="0.8" k1="-0.2127" k2="-0.0783" k3="0.0818" />
<vignetting model="pa" focal="38" aperture="7.1" distance="2.99" k1="-0.2615" k2="0.0942" k3="-0.0413" />
<vignetting model="pa" focal="38" aperture="9" distance="0.35" k1="-0.3304" k2="0.1910" k3="-0.0877" />
<vignetting model="pa" focal="38" aperture="9" distance="2.99" k1="-0.2948" k2="0.0632" k3="0.0084" />
<vignetting model="pa" focal="38" aperture="9" distance="1000" k1="-0.2501" k2="-0.0139" k3="0.0503" />
<vignetting model="pa" focal="38" aperture="10" distance="0.35" k1="-0.3139" k2="0.1111" k3="-0.0231" />
<vignetting model="pa" focal="38" aperture="10" distance="0.8" k1="-0.2054" k2="-0.0893" k3="0.0840" />
<vignetting model="pa" focal="38" aperture="10" distance="2.99" k1="-0.2487" k2="0.0702" k3="-0.0309" />
<vignetting model="pa" focal="38" aperture="27" distance="0.35" k1="-0.2429" k2="-0.0386" k3="0.0568" />
<vignetting model="pa" focal="38" aperture="27" distance="0.8" k1="-0.2201" k2="-0.0666" k3="0.0689" />
<vignetting model="pa" focal="38" aperture="27" distance="2.99" k1="-0.2537" k2="0.0273" k3="0.0118" />
<vignetting model="pa" focal="38" aperture="27" distance="1000" k1="-0.2525" k2="-0.0187" k3="0.0514" />
<vignetting model="pa" focal="52" aperture="3.8" distance="0.35" k1="-0.9862" k2="1.5176" k3="-1.0571" />
<vignetting model="pa" focal="52" aperture="3.8" distance="0.8" k1="-0.9201" k2="1.3741" k3="-1.0449" />
<vignetting model="pa" focal="52" aperture="3.8" distance="2.99" k1="-0.8762" k2="1.2055" k3="-0.9318" />
<vignetting model="pa" focal="52" aperture="3.8" distance="1000" k1="-0.7985" k2="0.9920" k3="-0.8039" />
<vignetting model="pa" focal="52" aperture="5" distance="0.35" k1="-0.1400" k2="-0.0891" k3="-0.0669" />
<vignetting model="pa" focal="52" aperture="5" distance="0.8" k1="-0.2264" k2="0.2546" k3="-0.3762" />
<vignetting model="pa" focal="52" aperture="5" distance="2.99" k1="-0.2442" k2="0.2825" k3="-0.4003" />
<vignetting model="pa" focal="52" aperture="5" distance="1000" k1="-0.1924" k2="0.1805" k3="-0.3570" />
<vignetting model="pa" focal="52" aperture="7.1" distance="0.35" k1="-0.1742" k2="0.0081" k3="0.0011" />
<vignetting model="pa" focal="52" aperture="7.1" distance="0.8" k1="-0.2320" k2="0.1925" k3="-0.1316" />
<vignetting model="pa" focal="52" aperture="7.1" distance="2.99" k1="-0.2439" k2="0.2000" k3="-0.1284" />
<vignetting model="pa" focal="52" aperture="7.1" distance="1000" k1="-0.1994" k2="0.1043" k3="-0.0799" />
<vignetting model="pa" focal="52" aperture="10" distance="0.35" k1="-0.1757" k2="0.0071" k3="0.0034" />
<vignetting model="pa" focal="52" aperture="10" distance="0.8" k1="-0.2301" k2="0.1639" k3="-0.0930" />
<vignetting model="pa" focal="52" aperture="10" distance="2.99" k1="-0.2567" k2="0.2141" k3="-0.1172" />
<vignetting model="pa" focal="52" aperture="10" distance="1000" k1="-0.1917" k2="0.0589" k3="-0.0272" />
<vignetting model="pa" focal="52" aperture="30" distance="0.35" k1="-0.2153" k2="0.1282" k3="-0.0825" />
<vignetting model="pa" focal="52" aperture="30" distance="0.8" k1="-0.3277" k2="0.3847" k3="-0.2234" />
<vignetting model="pa" focal="52" aperture="30" distance="2.99" k1="-0.2613" k2="0.2269" k3="-0.1220" />
<vignetting model="pa" focal="52" aperture="30" distance="1000" k1="-0.2448" k2="0.2069" k3="-0.1295" />
<vignetting model="pa" focal="80" aperture="4" distance="0.35" k1="-1.0001" k2="1.7099" k3="-1.2508" />
<vignetting model="pa" focal="80" aperture="4" distance="0.8" k1="-0.8171" k2="1.1223" k3="-0.9048" />
<vignetting model="pa" focal="80" aperture="4" distance="2.99" k1="-0.6866" k2="0.6255" k3="-0.5542" />
<vignetting model="pa" focal="80" aperture="4" distance="1000" k1="-0.6040" k2="0.3049" k3="-0.3172" />
<vignetting model="pa" focal="80" aperture="5.6" distance="0.35" k1="-0.2211" k2="0.3804" k3="-0.4195" />
<vignetting model="pa" focal="80" aperture="5.6" distance="0.8" k1="-0.2554" k2="0.5219" k3="-0.5681" />
<vignetting model="pa" focal="80" aperture="5.6" distance="2.99" k1="-0.2511" k2="0.5054" k3="-0.5791" />
<vignetting model="pa" focal="80" aperture="5.6" distance="1000" k1="-0.1988" k2="0.3306" k3="-0.4572" />
<vignetting model="pa" focal="80" aperture="8" distance="0.35" k1="-0.1692" k2="0.1116" k3="-0.0705" />
<vignetting model="pa" focal="80" aperture="8" distance="0.8" k1="-0.2144" k2="0.2462" k3="-0.1723" />
<vignetting model="pa" focal="80" aperture="8" distance="2.99" k1="-0.2371" k2="0.2874" k3="-0.1936" />
<vignetting model="pa" focal="80" aperture="8" distance="1000" k1="-0.2016" k2="0.1824" k3="-0.1275" />
<vignetting model="pa" focal="80" aperture="11" distance="0.35" k1="-0.1934" k2="0.1962" k3="-0.1297" />
<vignetting model="pa" focal="80" aperture="11" distance="0.8" k1="-0.1820" k2="0.1394" k3="-0.0807" />
<vignetting model="pa" focal="80" aperture="11" distance="2.99" k1="-0.2342" k2="0.2463" k3="-0.1382" />
<vignetting model="pa" focal="80" aperture="11" distance="1000" k1="-0.2174" k2="0.1818" k3="-0.0894" />
<vignetting model="pa" focal="80" aperture="32" distance="0.35" k1="-0.1182" k2="-0.0327" k3="0.0226" />
<vignetting model="pa" focal="80" aperture="32" distance="0.8" k1="-0.2135" k2="0.2117" k3="-0.1167" />
<vignetting model="pa" focal="80" aperture="32" distance="2.99" k1="-0.2355" k2="0.2356" k3="-0.1218" />
<vignetting model="pa" focal="80" aperture="32" distance="1000" k1="-0.2462" k2="0.2443" k3="-0.1243" />
</calibration>
</lens>
</lensdatabase>
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