I’ve created a distortion correction profile for Tamron 18-300mm f/3.5-6.3 Di III-A VC VXD Lens for Sony E to be used with Lensfun.
<lensdatabase>
<lens>
<maker>Tamron</maker>
<model>E 18-300mm F3.5-6.3 B061</model>
<mount>Sony E</mount>
<cropfactor>1.534</cropfactor>
<calibration>
<!-- Taken with Sony A6000 -->
<distortion model="ptlens" focal="18.0" a="0.02805" b="-0.10668" c="0.06382" />
<distortion model="ptlens" focal="27.0" a="0.01683" b="-0.04455" c="0.03014" />
<distortion model="ptlens" focal="38.0" a="-0.01212" b="0.06048" c="-0.07478" />
<distortion model="ptlens" focal="53.0" a="-0.00924" b="0.05064" c="-0.06029" />
<distortion model="ptlens" focal="60.0" a="-0.00417" b="0.0245" c="-0.02118" />
<distortion model="ptlens" focal="86.0" a="-0.00333" b="0.02128" c="-0.02027" />
<distortion model="ptlens" focal="100.0" a="0.01239" b="-0.03935" c="0.05252" />
<distortion model="ptlens" focal="129.0" a="-0.00494" b="0.02116" c="-0.01855" />
<distortion model="ptlens" focal="158.0" a="-0.00539" b="0.01724" c="-0.00662" />
<distortion model="ptlens" focal="196.0" a="-0.02316" b="0.09408" c="-0.11133" />
<distortion model="ptlens" focal="241.0" a="0.00321" b="-0.01004" c="0.01943" />
<distortion model="ptlens" focal="277.0" a="0.01905" b="-0.04979" c="0.03944" />
<distortion model="ptlens" focal="300.0" a="0.03685" b="-0.12817" c="0.15026" />
</calibration>
</lens>
</lensdatabase>
You can use it by saving the above file as lensfun.xml under ~/.local/share/lensfun/.