I have already been using a Cokin P holder with Singh-Ray filters for my 35mm ge ar. Will I run into problems using this system on my new 4x5 camera? I don't ant icipate using anything wider than a 90mm lens, so I am concerned about vignettin g.

I do both B&W and color work, so polarizers, ND grad filters, and color correcti ng filters will all be in my arsenal.

Also, do many people use gels? If so, how could you incorporate polarizers and N D grads into the holders?

Thanks in advance for your thoughts.