The Steiner 7x50mm Military R LPF Binocular 539 comes with a Reticle (R) and Laser Protection Filter (LPF). The Reticle features lines, numbers and indicators that are designed to be easily readable in daylight as well as in artificial light The reticle is adjusted parallax free to infinity and is built into the right half of the binocular. Utilizes precision optical engineering for maximum image clarity and brightness. The Binocular's advanced military design and fiber-reinforced polycarbonate rubber armored housing makes the Steiner extremely rugged and lightweight. The Binocular Telescope consists of a left and right side. The interpupillary distance (ID) can be adjusted by swiveling the halves of the binocular around its central axis. Each side of the Steiner Binocular consists of two parts, the optical carrier and the external housing. This unique construction allows for external force to be distributed and transferred away from the prism and other internal optical components.