The NC is a must have when you acquire an Nikon ED Lens. This is because you simply invested +1,000 USD to get (Low Dispersion) and then you can't simply use a 15 bucks UV filter form a regular manufacturer. I used those in the past and now I can see the difference. Also serves well as a protector for the primary lens from dust or harsh surfaces. Finally, if a scratch comes will be on the filter.