Endurance ED Marine Binoculars 7x42 Monocular - 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 Wrist Strap Nitrogen purged Waterproof and Fog-proof Hawke No-Fault Lifetime Warranty Specifications: Magnification: 7x Objective Lens: 42mm Lens Coating: Fully Multi-Coated Color: Blue Optical System: System H5 Field of View (Adeg): 7.5 Eye Relief: 0.7in, 17mm Exit Pupil: 0.24", 6mm Field of View: 393ft @100yds, 131m @100m Apparent Field of View (Adeg): 53 Close Focus: 6.6ft, 2m Prism Type: Roof Prism Glass: BAK 4 Eye Cups: Twist-Up Eyecup: 1.7in, 43mm Diopter Type: Eye Piece Tripod Mounting Thread: Yes (1/4" - 20 UNC) Height: 6.3", 159mm Width: 3.1", 121 - 80mm Weight: 14.3oz, 405g