Thanks everyone

I ordered a cokin kit for the Nikon DSLR today (found a kit on the cokin website that comes with holder, adapter and a filter) and will get the ND4 with it when I pick it up.

I worked out to be much cheaper to use this system then to go with the screw in type from say Hoya, especially if I get a lens of a different diameter down the track. Two ND screw ins came to the same price as two P series filters and the holder kit (roughly anyway).

I'll look at the graduated soon, once I get this going and sorted out.

Mick