The XCF series offers outstanding optical performance with multi coated optical elements, excellent viewing comfort, and a full body rubber housing. XCF series is ideal for almost any application from casual viewing to serious observation. Pentax's Super Multi Coating eliminates harmful ultraviolet rays and improves light transmission for high contrast images with no glare. The center focus system allows for accurate and speedy focusing on the subject with simple fingertip control. Incorporated in the right eyepiece ring, the diopter adjustment allows near and far sighted viewers to easily and quickly adjust the image to match their eyesight. High quality BaK 4 prisms transmit more light at the edges to enhance illumination for easier viewing in dim light. Includes lens cap, carrying case, and strap.Specifications Type: Porro prism center focusing Objective lens: 2 elements in 1 group Eyepiece lens: 3 elements in 2 groups Magnification: 12 X Objective lens diameter: 50 mm Angle of view: 5.6 degrees Apparent field of view: 67 degrees Field of view 1000 m: 98 m Field of view 1000 yd.: 294 ft. Exit pupil: 4.2 Eye relief: 11mm Prism: BaK 4 Multi Layer coating: 4 lenses Minimum focusing distance: 30 ft. Relative brightness: 17.4 Diopter adjustment range: 3 diopter Eye distance adjustment range: 2.3 in. 2.8 in. 58mm 71 mm Focusing range: 30 ft to infinity Eyepiece range: Collapsible Size: 6.5 in. x 7.8 in. Weight: 1 lb. 14 oz.