Polarizer for Zeiss 15mm f/2.8 ZF.2 lens.

Whatever filter you get, be careful about how thick it is.  Any "Extra Wide" type filter won't work as that type of filter normally steps up the diameter past 95mm.  This won't fit inside the built in hood.

Both the Zeiss and Marumi versions are about 5mm thick and do not vignette.  If I add a slim B+W ND to the Marumi, it vignettes in the deep corners....and the B+W ND filter is pretty darn thin.  So bottom line is that I can tell you 5mm or less won't vignette.  As you go thicker, you run the risk it will vignette.  I don't know the threshold though.  I'm guessing it's around 7mm, but that's just a guess.

-Tim