The ACULON A211 7×50 binoculars feature 7-power multicoated lenses and 50mm objectives fabricated with Nikon’s exclusive lead and arsenic free Eco-Glass. The BaK4 Porro prism systems within all ACULON A211 binoculars deliver a high quality image under a multitude of lighting conditions, making these binoculars effective from dawn till dusk. All together the ACULON A211 7×50 binoculars are a high-quality, and cost effective choice.Aspherical Multicoated Eco-Glass LensesDelivering a bright and clear image in most lighting conditionsA triad of optical technology is integrated into the ACULON A211 binoculars. Aspherical eyepiece lenses aid in delivering a flat field of view, while lens multicoating enhances image brightness. The environmentally-friendly Nikon Eco-Glass ’ lenses deliver astonishing clarity and precision in a lighter-weight, lead and arsenic-free glass composition.Turn-and-Slide Rubber EyecupsFacilitates easy positioning of eyes at the correct eye-point and allows for comfortable viewing during extended periods of use.