41mm 4x magnification Full anti-reflective coated optics featuring hydrophobic properties to shed water This lens has been developed and designed using very sophisticated design elements that are used in astronomy and binocular production Completely new scientific and technical approach nothing like what has been presented before by any other scope lens company Task specific and designed for tournament or hunting equipment for archery From the material to the curves to the coatings and how it's all put together, this lens is 100% purpose engineered to outperform all other options in the industry today Not an eyeglasses lens that has been repurposed to fit the archery application Plano - Convex base construction for ultimate performance Hardened glass for superior durability and coating resilience