Hi I am just curious.. What is the difference between a normal uv filter and a multi-coated one? Coz I was at this shop to get a filter for my lens. I was just going to get a normal Hoya UV filter but the shop assistant recommend me the hoya hmc filter instead. Said it is much better than normal uv filter. But the price is also more ex.. Issit worth the purchase? Any1 can advise? Thanks..