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Lower magnification allows the user to locate a subject more easily Multi-coated optics enhances sharpness of detail and crispness of color High quality BaK-4 prisms Long eye relief
The Celestron Skymaster 18-40X80 Zoom Porro 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") |
Focal Length Of Objective Lens | 328.6mm (12.94") |
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") |
Interpupillary Distance (Min) | 56mm (2.20") |
Diopter Adjustment Range | -4 to +10 |
Twilight Factor | 44.72 |
Relative Brightness | 10.24 |
Limiting Stellar Magnitude | Ideal: 12.01 |
Moderate | 11.01 |
Poor | 10.01 |
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" x 4.7"x 14.0") |
Free Shipping | No |
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