Arthur, thanks for the criticism of my review and I totally agree with you--I should have used the filter first. So now I have. It keeps dust off my lens very well. It fits perfectly on my Nikon zoom lens. I have been told it is the sort of filter to use on a digital SLR. Does it eliminate UV and other pesky rays? Who knows? I have faith that it does. A photog dealer also told me the lens is highly resistant to breakage, and perhaps I should have noted that. I haven't put it to the "breakage test." However, I've never damaged a filter in 50+ years of picture taking, so don't worry much about that. The vendor sent the filter in a timely manner, so will give high marks for that. Otherwise, how the heck does one know everything a filter is doing? Let's just say, so far I love it. Will still give max marks.