I bought this for a camera that is rarely used. It is still a valuable collector's piece that I want to keep in great condition and that means I had to protect the lens. I only have filters with the German Schott glass Zeiss "T" coating on cameras that I use a lot because I think they are the best multi-coated filters I can afford, but I can't spend the money on them on a camera that I rarely use. Any camera that is threaded to accept a filter deserves the protection that comes with a filter mounted in front of the actual camera lens. I'd rather risk damaging the AR coating on an easily replaceable filter than risk damaging the actual lens on any of my cameras through cleaning and exposure to dust or chemicals in the air. This brand of filter came neatly packaged and the filter holder that comes with the filter is well designed and provides excellent protection for the filter when it is not on the camera lens because I am using a different type of filter. This filter has multiple AR coatings on both sides of the filter and after comparing the results of identical images taken with the same camera with this filter and one of my prized and now unaffordable Zeiss "T" filters I can say that I see no difference in the results. I'm sure an optical lab could document some differences but in the real world I can't tell any difference when I compare test images I took with this filter and the Zeiss filters I used. This design works so well that I am slowly replacing the older non-Zeiss filters I have on my older lenses and cameras with these newer designs.