If you don't have a circular polarizer and are using any Canon lenses with a 58mm thread, you may want to consider adding this to your camera bag. Does wonders with skies and water and landscapes in general. Filter has no scratches whatsover. I moved up to L lenses and didn't realize that I never sold this. Has had very little use. New they are $90 from B and H photo. Selling for $50.
Comes with case (and shown) and should cost about $5 to ship.