Styrka S7 Series 10x42 ED Binocular, Dark Green (ST-35522) Extra low dispersion (ED) optical glass provides razor sharp images and superb color correction while dramatically increasing clarity during low light situations All lens surfaces are coated multiple times with our SXL-MAX anti-reflective broadband coatings for maximum brightness, color, sharpness and image contrast across the entire visible light spectrum Phase and dielectric coated BaK-4 prisms dramatically increase light transmission through the prism system for bright, high-contrast images with better resolution, superior clarity and detail Twist-up eyecups twist up or down for a custom fit to your eye with or without eyeglasses Waterproof and nitrogen purged to prevent internal fogging