I have a canon 400d and have been reading lots on the filter/no filter debate. I love taking pond, river pics and the reflections/refraction have ruined several potentially good pics. Cld you advise me on what make of 'circular polarizing filters' to get pls ? I use a canon 75-300mm IS; a canon 60mm macro, (tho about to change that to 100mm); a 10-22mm and a 24-70mm 2.8. I don't mind too much cost as long as it's not a waste of money. thanx