Nikon 8257 ACULON T51 8x24 Binocular (Black) The ACULON T51 8x24 is built with multicoated Eco-Glass lenses that deliver astonishing clarity. Built with an aluminum body, the ACULON T51 is durable and easy to hold. The ultra-compact design makes it easy to take this binocular to any outing or event.