Originally posted by ChatMechant Some interesting flare on this one:
Does it have a maze pattern when you zoom in like 300% into purple area of the raw file? It looks a little bit like the sensor crosstalk that's very common on Fuji amongst others. I've once produced it on my K-3 II with the DA15. UWA lenses can make the rays come at steep angles making the light bleed across sensor "pixels". Light that forms flare can have even more extreme angles as it's coming from outside the normal path.
I see some flare that looks like sensor flare, ie those dotted/striped flares, in your image which makes me suspect it is indeed the sensor purple effect. DSLR's are more resistant to it thanks to the flange distance but it can happen. Seems much more common on milcs though.
So you have UWA making rays come in at low angles to the sensor plane, then you have flare enabling even more extreme angles, this causes light come it at super low angles and reflection off the sensor as well as green pixels being affected by light coming through the adjacent red and blue pixel filters.
A quick internet search gave this article
Why and How Fuji Cameras Produce a Strange Purple Flare/Grid Artifact | PetaPixel
Edit: oh by the way I could make it go away in Rawtherapee by changing the demosaicing algorithm and the Green equiliberation setting. If I'm not mixing things up that is.
Last edited by house; 05-17-2022 at 04:07 AM.