Hi Thomas and Jens, thank you for your quick replies!
Good catch Thomas, I was missing the extension (I got sucked in by the 
default for multiple images)
I will encourage my friend to make the flat properly - he has the equipment 
and is currently busy so I am doing the legwork on his images for him - I 
don't have his camera equipment to do it. I was hoping a theoretical 
correction would be close enough and quick. Interestingly lens fun does not 
have the vignetting for the lens. 

Coming to chromatic aberration: lensfun gives 
<tca model="poly3" focal="10" br="0.0001349" vr="1.0002043" bb="-0.0000252" 
vb="1.0001449" />
I see the red, red, blue, blue values. But the fulla command line asks for 
4 for each colour:

fulla  -r 0.0001368:0.0002725:-0.0006605:1.0007630 \
       -b 0.0011642:-0.0046154:0.0055706:0.9989218 \
        input.tif

Not sure what to do here. 

I appreciate the time you put in to help folks - very kind of you.


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