Forgive me if this has been answered before.
I just took receipt of my schneider IIf Center filter for my 35XL.
Since I'm doing a lot of shifted panos with +/- 18mm on the STC I decided it was worthwhile and doesn't seem to affect sharpness.
The problem I am now running into is having the filter holder further from the lens I am getting vignette at full 18mm shift. I can only really go out to 14mm.
Has anyone encountered and come up with a solution to this problem? I am already using a wide angle adapter for the lee system.
I'm trying to 3D print a 'donut' that I can attach to the center filter that holds the filter holder even closer to the lens but I don't know how successful that will be.