Summary: I have always used a Uv filter on front of my lenses as an extra layer of protection from scratches, etc. Some that I have used in the past were of lower cost and of much lower quality. With the Hoya filters, I do not feel as though I am sacrificing any clarity or contrast in my images by having it there. After testing it out with this one ... I bought one for all of my lenses.
Pros: Clear Optics, Easy To Use, Firm Mount, Strong Construction
Summary: I bought this filter for my 28-135 Canon Lens. I bought it mostly to protect my lens. I don't see any issue with dust being attracted by this filter. I didn't want to pay more for a B+W filter. I had a good price from Ace Photo Digital, under $40, I am quite happy with them, cheap and fast!
Summary: Purchased a D300 kit with the 18-200mm VR lens. I spent just about as much time trying to figure out if I was going to buy a filter. DO IT You can pull the filter off the lens wash with de-ionized cleaner wipe off and you are back in action. Off on location with a class of 7-8 years olds, yes a sink, soap, water and a small Micro Fiber and you are back in action after the "I like your camera" sticky finger and all experience. Yes, the shots are sharper too.
Pros: Clear Optics, Easy to clean, Firm Mount, Strong Construction
Summary: It is an excellent filter. It is a must have for my precious lenses. The It isn't has sturdy as B+W filter but it does basic UV and dust protection. There is no defect or coating problem on this 72mm but the one I got for 52mm has 3 tiny wash out coating spots.