top of page

Nikon Action EX 16x50 Water proof nitrogen filled Binoculars bak-4 FMC for birding, wildlife ,astronomy, sight seeing


Lead- and Arsenic-Free Eco-Glass

BAK4 Traditional Porro Prisms

Fully Multi-Coated Optics

Wide 60° Apparent Angle of View

Nitrogen Filled, Water and Fogproof

Large Center Fast-Focus Knob

Tripod Mountable with Optional Adapter

Twist-Up/Click-Stop Rubber Eyecups

Long Eye Relief and Wide Exit Pupil


The Nikon 16x50 Action Extreme Binoculars is an ideal optic for boaters who often find themselves scanning the water for shoals, shore, and buoys or just trying to identify obstacles on rough or rolling seas. To help mitigate the disorientation and discomfort often experienced when looking through high-power binoculars on the water, the Action Extreme has a wide field of view and a generous exit pupil that keep the entire scene in view and minimize the movement of the horizon line, plus a comfortable eye relief that provides the room to back the eyes off the eyepieces for a more comfortable viewing position. The traditional Porro prism design, when combined with the over-sized objective lenses, BAK4 prism glass, and anti-reflection fully multi-coated optics, delivers immersive high-contrast views that are bright and sharp, with accurate colors and a rich depth of field so users can differentiate the relative distance between objects in the view—even in low light.

Complementing this optical performance are design details that allow the Action Extreme to withstand the rigors of outdoor life. The Porro prism design has an inherently balanced and comfortable feel in the hand for long-duration observation sessions, and the chassis is wrapped in a rubber armor that provides a sure and reliable grip in cold and wet weather. Its optical tubes are nitrogen filled and O-ring sealed to be waterproof, and resistant to internal fogging when moving through extreme temperature and environmental conditions. Because of the high magnification and large objectives, hand holding the binocular for long periods can cause fatigue and excessive hand shake, so Nikon made it tripod mountable for easy and convenient hands-free use. A tethered one-piece ocular rainguard covers the eyecups as they hang around the neck and prevents rain and spraying water from filling them, and the object lens caps can clip onto the neck strap to keep them safe from blowing overboard or being lost on the forest floor.

From the trail, to the range, to the boat, the 12x50 Action Extreme binocular is engineered to deliver the high-power long-distance performance required by discerning observers—especially boaters and avid outdoor enthusiasts who won't let inclement weather and rough seas keep them at home or in a safe harbor.

Optical Performance

Powerful 16x magnification allows detailed observations of distant subjects on land and sea

Large 50mm objective lenses provide improved low-light performance versus smaller-objective models, ensuring images are bright even in challenging conditions

Traditional Porro prism design makes it comfortable to hold and presents a rich depth of field

High-index BAK4 prisms deliver a round exit pupil and a crisp and clear image with limited edge distortion

Anti-reflection fully multi-coated optics produce neutral and accurate color fidelity and improve contrast and image brightness

Prism Type Porro


Magnification 16x

Objective Lens Diameter 50 mm

Angle of View 3.5° (Actual)

Field of View 183' @ 1000 yd / 60.8 m @ 1000 m

Minimum Focus Distance 23' / 7 m

Exit Pupil Diameter 3.1 mm

Eye Relief 17.8 mm

Interpupillary Adjustment 56 to 72 mm / 2.2 to 2.8"

Diopter Adjustment Yes

Focus Type Center


Fogproof Yes, Nitrogen Filled

Water Resistance Waterproof


Dimensions 7.7 x 7" / 19.6 x 17.8 cm

Weight 36.7 oz / 1040.4 g

Packaging Info

Package Weight 3.3 lb

Box Dimensions (LxWxH) 9.7 x 8.6 x 4.1"

Nikon Action EX 16x50 CF Water proof nitrogen filled Binoculars bak-4 FMC for bi