I'm get back into large format photography after a 20 year break. I'm presently in the process of collecting pieces for a 4x5 kit. My plan for lenses are probably a 90, 210 and something >300mm. I already have acquired a 210mm Symmar-S and have been looking at 90mm Angulons, Super Angulons and Fuji's. My question is what filter size/system should I chose that would be suitable for these lenses. The two choices that I see most often mentioned are filters compatible with the cokin p-series or 4"x4". The trade-off seem to be the p-series are smaller/cheaper and the 4"x4" are larger and less likely to vignett. Does anyone know if the p-series filters can be used on a 90mm without problems, or should I just spend the money upfront for the 4"x4'. Also does anyone have any inforomation on the cokin z-pro system?