i have a Nikon D5000 with 18-55mm kit lens and would like to buy some filters: skylight (for protection), circular polarising and close-up.

First of all can you confirm that I'd need to get 52 mm screw thread size for this lens, and if I later upgrade to an 18-200mm lens, would they still fit?

Also, my instruction manual says you shouldbuy Nikon filters (surprise, surprise) as others may interfere with the autofocus or electronic rangefinder. Has anyone used other filters e.g. hoya, Jessops, or even any of the real cheapo ones advertised on ebay (4 lcose-up filters for 8.95!)

Any tips very welcome,