After shooting several images with the Samyang 12mm f/2 for mirrorless APS-C, I noticed it produces a quite strong color cast. It looks like green vignetting. As far as I know, this isn't uncommon for wide-angle lenses.
I experimented with radial filters in Lightroom, but the results weren't satisfying. Is there a method or tool to consistently remove this cast?
Here is an example taken at daylight, ISO 200 and f 5.6, which isn't even wide open. I cranked up saturation to make the defect more apparent.
Here is the same image without editing: