The ATN Professional series riflescopes are the only scopes in the world with the Everlight and Proshield Lens Coatings. ATN developed and formulated these two exclusive lens coatings specifically for the Professional series. The revolutionary Everlight coating is designed to enhance the resolution and contrast of your image in extremely bright conditions. When there is too much light you will normally notice a degraded optical image, which is prevented by our Everlight coating. Some of the leading scope manufacturers have been installing less reliable mechanical aperture shutters to compensate for this problem.