Celestron 18-40x80 SkyMaster Zoom Binocular

- Lower magnification allows the user to locate a subject more easily and then zoom in for a close-up view - Multi-coated optics enhances sharpness of detail and crispness of color - High quality BaK-4 prisms provide higher light transmission for better viewing in low light conditions - Large objective diameter provides a comfortable viewing aperture at high magnification levels - Long eye relief for more comfortable for all users; essential for those wearing eyeglasses while viewing - Diopter adjustment allows for refinement of image to correct for any differences in strength between the users own eyes - Tripod adapter included to mount the binocular on a tripod for prolonged viewing sessions or simply for increased stability while observing Celestron’s SkyMaster Series of large aperture binoculars are a phenomenal value for high performance binoculars. Ideal for astronomical viewing or for terrestrial (land) use, especially over long distances. SkyMaster models feature high quality BaK-4 prisms and multi-coated optics for enhanced contrast. Celestron has designed and engineered the larger SkyMaster models to meet the special demands of extended astronomical or terrestrial viewing sessions. Magnification: 18-40x Objective Lens Diameter: 80mm (3.15 #34;) Angular Field of View: 18: 1.9° Linear Field of View (@1000 yds) / @1000 m): 96 ft (33.2 m) @18x Exit Pupil: 4.4 @18x / 2.0 @40x Eye Relief: 20.3 @18x Close Focus: 106.2 ft (32.4 m) @18x Interpupillary Distance (max): 72mm (2.83 #34;) Interpupillary Distance (min): 56mm (2.20 #34;) Diopter Adjustment Range: -4 to +10 Twilight Factor: 44.72 Relative Brightness: 10.24 Lens Coatings: Multi-Coated Prism Glass (Type): BaK-4 Prism Coatings: N/A Weight: 76 oz (2155 g) Environmental Protection: Water Resistant Nitrogen Filled: No Tripod Adaptable: Yes Carrying Case: Nylon Dimensions: 228mm x 120mm x 355mm (9.0 #34; x 4.7 #34;x 14.0 #34;)