Fixed Min and Max Densities - Provides consistent and repeatable results ULCA Multi-Coating - Decreases flare and significantly reduces chromatic aberration NANO WMC Coating - Scratch-resistant multi-coating that repels water and oil making it easier to clean Black Coated Glass Edge - Prevents internal reflections and decreases optical flare CNC Matte Black Brass Ring - More resistant to side impacts, less likely to bind when placed onto a lens