Nikon 10x42 ProStaff 3S Binoculars Lead- and Arsenic-Free Eco-Glass Silver-Coated Roof Prisms Multicoated Optics Nitrogen Filled, Water and Fogproof Great for birding and watching shooting stars! These binoculars feature silver-alloy-coated roof prisms and anti-reflection multicoated optics that produce bright and clear high-contrast images with true color rendition across the spacious and wide field of view. The 42mm objectives boost their light-gathering ability to improve views in challenging light such as at dawn and dusk or in foggy and cloudy weather without the bulk and weight of larger-objective models. Their wide apparent angle of view helps to mitigate the appearance of visible hand shake that is often associated with holding powerful optics such as this and minimizes movement of the horizon line on rough or rolling seas to limit disorientation when using them on a boat. The combination of prisms, optical coatings, wide field of view, and comfortable eye relief allow users to enjoy a comfortable and immersive observational experience in most lighting conditions. More specs here: https://www.bhphotovideo.com/c/product/1225884-REG/nikon_16031_10x42_prostaff_3s_binocular.html/overview?fromDisList=y