Description
Description
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.
Features
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 user's own eyes
Specifications
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")