Oh bugger, I have just discovered that my Cokin P-series polariser vignettes on the 55mm f/4 for the 6x7 :-( This is using a cut-down holder (*).
I am most dischuffed about this 'cos the same setup doesn't vignette with grad NDs on the 55mm or with anything on the 24mm f/2.8 for 35mm. So my question is, what have other 55mm owners done? Used a standard 77mm polariser? A narrow 77mm polariser? Bit the bullet and gone for a 100mm modular system like Lee? The price of the polariser for the Lee system makes my eyes spin and I probably can't justify that outlay at the moment. The only thing I don't want to do is buy an ordinary 77mm polariser and find it still vignettes - so, your experiences please? Chris (*) in true Cotty-esque fashion, slice off the outer grooves of the holder so it only holds one square or one circular filter.
