As was mentioned, the Cokin filters are the bottom of the line, but will allow you to get a feel for things. The two issues people seem to have with Cokin are that they do alter color slightly (are not a true neutral density) and that, being cast resin and not glass, they can distort images from a very good lens. For black & white they are fine for most things, but if you are shooting E6 and are picky about staying with color renditions, it may not look right. tim