Magnification: 12x / Objective Lens Diameter: 50 mm / Eye Relief: 14mm / Exit Pupil: 4.1 mm / Linear Field of View: 271 feet/1000 yards New optical features include fully multi-coated and dielectric coating which increases light transmission and provides bright, clear, color-accurate images. Features an improved magnesium chassis to stay lightweight and offer even more rigidity in the structure, as well as a new smaller hinge allowing for easier handling. Roof Prism Binoculars with phase correction coating to enhance resolution and contrast Argon gas purged and o-ring-sealed to prevent fogging, moisture, dust and debris from penetrating the binocular for reliable performance in all environments