I have a few questions about filters and the cokin 'creative system'. 1. I bought my DSLR two days ago (Nikon D40) and I asked for a way to attach gradient filters so he gave me the cokin filter holder attachment. (I didn't realize I'd paid $24 for a little piece of plastic until I got home, but that's another story) Do I need an adaptor ring? I didn't get one with the filter holder (even though it mentions it furiously in the example pictures), the filter holder kinda sits in the groove on the end of my lens, but I don't know if that's normal or if I should buy an adaptor ring as well? 2. It's the A series, meaning it says it can hold "up to 62mm ring" filters. I am looking at a Tiffen filter kit, which comes with a few ring polarizers. But they are 58mm in size. Would this be too small, or would they sit in there fine? 3. I want to buy some gradient filters because I love sunrise photography. Can someone suggest some good beginner gradient filters? I was recommended to look at the 121 range of Cokin filters and was thinking about the Gradual Grey (ND2) 121L and (ND4) 121M to start with? Thanks for any help here. I'm a complete beginner to this but very enthusiastic.