Summary: I use the Nikon NC (Nikon Clear) filters on all my lenses. They are very well built and the multi-coated glass does just what it is supposed to do - protect the lens without effecting the quality of the image.
Summary: Why would you save $15 on a generic filter to sit right in front of your $400 Nikkor lens? Remember, your lens are just as good as the worst piece of glass where the light passes through. Don't make that be your filter... Spend the extra 15 bucks and enjoy crisp clear pictures!
Summary: i use the product on my 50mm, f/ 1.4, and Nikon D40. i bought it on a whim, thinking "must protect the lense" but i think if i could go back i would have bought a hood instead. the only drawback to it, is it makes the lense cap a little harder to put on and it seems like it may come off a little too easy. since it's december and i'm in maine, all my shots are indoor (our snow is almost up to the bottom window pane on one side).
Pros: Clear Optics, Easily Mounted, Firm Mount, Strong Construction
Summary: I am very pleased with the quality of this clear glass filter. A must have for any new lens. I purchased some other non-Nikon filters prior to this and was very disappointed. For about the same price, the Nikon filters are very good.
Summary: Never noticed any difference in quality, so it's pretty transparent to me. It protects my lenses so that I don't have to worry about scratching the coatings. It cheap enough so I don't have to worry of scratching the filter itself, so it kind of a 'don't worry' accessory. This does feel good indeed, and of course you can install additional filters and acessories over it, so I bought one for each of my lenses and always leave them on.
Summary: Have this filter on my Nikon 50mm f/1.8 and it works great. The pictures come out completely clean and it's good to know that my glass is protected. Not sure how it stacks up against other filters as I prefer buying accessories like this strictly from Nikon.