"That's because Pentax premium level quality and clarity are within reach, at a price that's within reach, too. Every Z-series (Green) model is built for critical observation. Pentax: designed to delight the most demanding users. Designed to inspire the most dedicated enthusiasts. Premium Multi Layer Coatings Premium multi-layer coatings assure the maximum light transmission through the binocular. The result is bright, crisp, true-to-life images in the widest range of viewing conditions. Magnesium Alloy Construction Magnesium alloy construction balances durability and weight. The lightweight design is built to handle rough and tumble conditions of life's adventures. Phase Coated Roof Prisms Phase coated roof prisms allow the maximum light transmission for sharp, high contrast images. Specialized Protective Coating Specialized protective coating repels dust, water and grease to keep your optics clean and your image quality at its peak. Hybrid Aspherical Lens Elements Hybrid Aspherical lens elements provide exceptional edge-to-edge sharpness. This assures that items on the edge of your field of view are just as sharp as those in the center."