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Hi Allan
Do you run Adobe Lightroom?
It can be a pain in the butt program to get your head around, however if you have it you can visit labs.adobe.com and look for "download profile creator" or "lens profile download utility".
You can also google the above. both allow you to search for lens profiles or create your own. I have a Samyang 24mm. Bloody good lens, I'm in the process of doing the same as you.
Hope it helps anyway
Regards
Carl Rainer
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