It has been confirmed on this forum in previous posts on this subject that Autopano Pro/Giga is incapable of correcting for radially symmetric variations.
That´s not completely correct. I always stated that earlier versions of APG did a VERY fine job compensating those issues.
Basically i assume, that better compensation CAN be done - but first Kolor needs to realize the issue at all.
Each and every lens produces vignetting. No question at all. BUT: using a lens @ f:8 and f:11 means that vignetting becomes hardly
visible with good lenses.
I had the experience that the VERY SAME LENS - my 1,4/85mm Nikon - NEVER had issues regarding vignetting BEFORE Kolor changed from Smartblend to what it is now.
All in all the new blending clearly gives better results than Smartblend. But at the same time the compensation of even minimal vignetting
became worse than it was before.
My strategy - which i never needed to do before - is: i process all my images carefully regarding vignetting in CaptureOne Pro before stitching.
I use the option of having C1 create a LCC-file for each shooting session - doing an additional shot by holding a piece of white plexiglass firmly on the front-lens. This shot is used in C1 for analysing the lenses behavior regarding color-cast, dust and vignetting.
The LCC - Lens Cast Calibration - profile is extremely helpful for achieving excellent image-quality before stitching.
Of course the base for all this is determined by the basic-quality of the lens . . . You cannot make a mediocre lens a brilliant one by using software.