Correcting vignette when PS slider is not enough

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Mr Keyboard Forum Member • Posts: 91
Correcting vignette when PS slider is not enough

I recently got into 617 with a very affordable 3D printed 617 camera (Malefic M617) and Super-Angulon 90/8. The lens has some vignette even at f22. According to Schneider data sheet, the luminance decreases almost linearly from 100% at center to about 30% at 617 edge. The result can sometimes be like this:

The traditional way to correct the vignette is using a center ND filter, which is nowadays more than twice as expensive as the lens itself for some reason. To me correcting it digitally in post is the way to go. However one problem is that using Photoshop's lens correction filter, even with midpoint slider at 0%, the center spot where brightening starts is still not small enough. Do you have a recommendation on how to correct this?

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