The ACULON A211 10-22x50 zoom binoculars feature adjustable 10-22-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 10-22x50 zoom binoculars are a quality, cost effective choice.y