The nitrogen-filled and O-ring sealed Endeavor ED is waterproof and fog-proof, making it suitable for demanding weather conditions. Extra-low dispersion glass effectively reduces color dispersion and enhances color resolution and contrast. ED glass aligns colors so they converge in the same focal plane, minimizing chromatic aberration and achieving the highest resolution and best image contrast. As a result, the image is sharper. The P2 phase coating has been designed for improved image sharpness and true color reproduction. Vanguard's P2 phase coating on the BaK4 prisms ensures crystal-clear images and high-resolution observation. The V-Max silver coating is one of the most advanced lens treatments in optics, providing sharper, more vibrant images and clearer contrasts through impressive light reflection.