Check the listing for details. Vortex Vanquish 10x26 Reverse Porro Prism Binocular. Condition: New. Listed at 109.95 USD. This little wonder comes courtesy of forward-thinking engineering and on-the-go tactics. The reverse porro prism design uses high-density glass and fully multi-coated optics to render images crisp and bright with a wide field of view. That makes quick work of scanning any landscape a given with the 10x26 Vanquish binocular. Weighing in at merely 12.7 ounces, and competitively priced, this compact performer delivers in more ways than one. OPTICAL FEATURES Fully Multi-Coated Multiple anti-reflective coatings on all air-to-glass surfaces increase light transmission. CONSTRUCTION FEATURES Reverse Porro Prism Valued for a rich depth of field, compact design, and three-dimensional image. Waterproof O-ring seals prevent moisture, dust and debris from penetrating the binocular for reliable performance in all environments. Fogproof Nitrogen gas purging delivers fogproof, waterproof performance. Rubber Armor Provides a secure, non-slip grip, and durable external protection. CONVENIENCE FEATURES Adjustable Eyecups Twist up and down for comfortable viewing with or without eyeglasses. Center Focus Wheel Adjusts the focus of both binocular barrels at the same time. Diopter Adjusts for differences in a user's eyes. Located on right eyepiece.