Endurance ED Marine Binoculars 7x50 - BlueA range of optics designed specifically for marine applications.For over a decade, Endurance ED optics have been renowned for incredible performance and reliability. Now, with the introduction of the Marine range, we have expanded upon this award-winning selection with optics specifically designed for marine and boating applications.With a range of models to choose from, the Marine Optics family features binoculars and monoculars to suit any requirement.Advanced BAK-4 roof prism optical systems make far more compact, modern, and lightweight optics than the industry norm.Features: 7x Magnification Perfect For Marine Applications Extra-Low Dispersion (ED) Glass Phase Corrected High Resolution Phase Corrected BAK-4 Roof Prisms Twist-Up Eye Cups With Position Stops Stay-On Lens Covers Floating Neck Strap Nitrogen purged Waterproof and Fog-proof Hawke No-Fault Lifetime Warranty Specifications: Magnification: 7x Objective Lens: 50mm Lens Coating: Fully Multi-Coated Color: Blue Optical System: System H5 Field of View (Adeg): 7 Eye Relief: 0.8in, 21mm Exit Pupil: 0.28", 7.1mm Field of View: 367ft @1000yds, 122m @1000m Apparent Field of View (Adeg): 49 Interpupillary Distance: 2.2 - 3", 55 - 75mm Close Focus: 8.2ft, 2.5m Prism Type: Roof Prism Glass: BAK 4 Eye Cups: Twist-Up Eyecup: 1.8in, 45mm Diopter Type: Right Eye Tripod Mounting Thread: Yes (1/4" - 20 UNC) Height: 6.9", 175mm Width: 4.8 - 5.3", 121 - 135mm Weight: 31.2oz, 885g