What size filters and OAG's are folks using with the 11000 camera?
I have used the 11000 mono camera for some 7 years. Since I like small and compact things I got a version with integrated filter wheel (also to have the filters close to the chip as possible). I had Moravian G3-11000 (now ManuelJ has it). I used 50mm unmounted round Astrodon filters and F/4.3 system of Borg77EDII and F/3.6 Wynne 0.95x 3" ASA systems.
My conclusion - to really avoid vignetting - a nice would be to use 50mm square filters!!! with a FW mounted as close to the chip as possible :-)
Otherwise I was getting (overall in the system) about 25% of vignetting, but in extreme corners (few 10-50 pixels the vignetting was already 50% due to limits on Borg optics and/or due to fastness F/3.6 of the ASA).
that is my experience.
I'd normally get 5pos FW for square 50mm filters like what Moravian sells for G4 cameras, but with a G3 camera (or C3 that stands for new series of CMOS from Moravian).
about IMX455 - I plan to get the mono version (from ZWO). Initially I will use it just with a solo Ha filter (2"). I have currently OSC IMX094 camera and I have to use UV/IR cut 2" filter in front of it: