I have some filter questions. I'd like to get a Cokin filter system some time in the next few months, as I would like to use graduated ND filters for landscapes. I'd also like to get a circular polariser soon, and was thinking of getting a screw-in type (as I don't imagine I'd have the Cokin setup on the lens at all times). My question is, can the Cokin filter system be installed on the "outside" of a screw-in CPL filter? Is what I'm proposing the best approach, or should I get a Cokin CPL filter instead? Also, as far as the screw-in CPL filters are concerned, is the image quality obtained with the Hoya "Pro" range good enough to justify the higher price compared to the cheaper version?
Any thoughts and advice would be appreciated!
Thanks a lot.