Nikon to possess a long time, I could see that the anti-reflective coatings technology had come a long way ... and that's mostly what we ask for a filter: not to create spurious image or 'halo effect (so-called "ghost" or "flare" in English).
Generally, this defect is seen through the viewfinder in a picture against the light without sun visor. But if we want to have a clear idea, we set up the device, it is the same image with and without filter ... and gone home, the images are compared on the computer.
Another quality anti-reflective quality treatments is able to support the other a clean cotton cloth or air-blowing. This filter supports HD cleaners made for optics (alcohol-based).
It is essential to clean any fingerprints.