I like these Cokin ones quite a bit. I have a whole batch I am experimenting with and contrary to what the guy who gave them to me told me they do seem to be working with my digital just fine. I can't quite figure out why he said that actually because the first resin filter I ever saw was being used by Bryan Peterson on a digital Nikon in one of his training videos! It was one of the Sunset ones. I have these thus far: Regular: Vivitar VMC Skylight 1A 49MM Canon Skylight 1A 42MM Tiffen Red 1 52MM Tiffen Polarizer 52MM Tiffen 49/52MM Haze Tiffen 55MM Sky 1-A Cokin Type: Cokin Cromofilter A-056/057 Star 4XA-8XA Cokin Cromofilter A-198-Sunset I Cokin Cromofilter A-150 Fog Cokin Cromofilter A-123 Blue Graduated Cokin Cromofilter A-160 Polarizer Cokin Cromofilter SA-B397-Pre-Shaped Frames (2 sets) Cromatek Grad Vignette Low Key V-16 Cromatek Colored Cameo Grey CC1 Cromatek Colored Soft Cameo Grey ND-2 CS12 Tek Filter CF-3 Radial Zoom Ambico-7740 Skylight Ambico Yellow-Green X1/11 Kodak Ultrachrom 50 Moonlight Braun 34 Color Filter Lens with Four Colors in Case Cokin A Filter Holder I'm definitely thinking of adding either a R,G,B,Y basic either on lens or resin set, and the Cokin Sunset II is definitely on my list. I do have the red in a Tiffen screw on, but the square filters actually seem more versatile to me as they can fit almost any camera I own. I was wondering what other special effects filters you all have and like to use? Is there anything else you'd suggest I add as I go along? What's in your bag filter-wise besides the average UV ones? Just curious. I'm mostly an "au natural" photographer. I've never much used the filters I bought with my digital actually, but I do like these Cokin color and special effects ones I've gotten so far. I know you can do most of this in Photoshop or via a plugin now too, but I'm still into using these and having some fun anyway. I think the sunset and star filters I have are my favorites so far.