ZULU10 HDX combines high-definition and high-transmittance glass lenses for ultra-high image resolution and optimal light transmission. SIG's proprietary LensArmor, LenShield, and SpectraCoat technologies, the image generated through the best-in-class Abbe Koenig prism is incredibly sharp from dawn to dusk. The locking diopter ring and main focus dial have been updated to sleek anodized aluminum with a textured rubber over mold. Featuring 3-position adjustability and an updated detent system, the ZULU10 HDX eyecups are designed to maintain their position throughout frequent movement in and out of bino harnesses.Features :Proprietary anti-reflective SpectraCoat, LensArmor, and LenShield TechnologiesLocking Diopter Ring and 3 Position Adjustable EyecupsZULU10 HDX Features a Reinforced Metal Housing Wrapped in Rubber ArmorEVA Carrying Case