Oberwerk OB8x40M New! Oberwerk Mariner binoculars are a step up in image quality over our LightWeight Series. They are available in your choice of 8×40, 7×50, or 10×60 models. The Oberwerk Mariner Series binoculars feature heavy-duty rubber-armored metal construction, oversize BAK4 prisms with shockproof mountings, extra-rigid and precise center-focuser, right ocular diopter adjustment, twist-up eyecups, brass 1/4-20 tripod adapter threading, and hard case. Features: -Extra-rugged waterproof mil-spec binoculars. -Ideal for birding, hunting, surveillance, astronomy, and of course nautical applications. -Objective size: Choice of 40mm. -Magnification: Choice of 8x. -Prism: Oversize BAK4. -Optic coating: Fully broadband multi-coated. -Field of view: 8×40- 145m at 1000m (8.4°). -Exit pupil diameter: 8×40- 5.0mm. -Exit pupil distance (eye relief): 8×40- 18mm. -Minimum focus distance: 8×40- 5m.