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Nikon Aculon A211 10x50 bak-4 porro prism binocular


Product Highlights


  • Aspheric Lens Design
  • Lead- and Arsenic-Free Eco-Glass
  • BAK4 Traditional Porro Prism Design
  • Anti-Reflection Multi-Coated Optics
  • Wide 60° Apparent Angle of View
  • Large Center Focusing Wheel
  • Slip-Resistant Rubber Armor
  • Tripod Mountable with Optional Adapter
  • Twist-Up, Click-Stop Rubber Eyecups

Optical Performance

Powerful 10x magnification allows for detailed observations of distant subjects

Large 50mm objective lenses improve light-gathering ability for bright and clear images, even challenging conditions such as at dawn and dusk

Traditional Porro prism light path produces a rich depth of field, allowing the user to discern the relative distances between objects in the view

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

Aspherical eyepiece lenses correct spherical aberration to produce clear and crisp images, with reduced edge distortion and astigmatism

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

Wide 60° apparent angle of view reduces the appearance of visible hand shake that is common when holding high-power optics such as this

341-foot field of view at 1000 yards

Use and Handling

Large slip-resistant center focus wheel is easy to manipulate, even while wearing gloves

Right-eye dioptric correction compensates for individual user's optical prescription for clearer and sharper views

56-72mm interpupillary adjustment range

Twist-up click-stop rubber eyecups for comfortable use with or without eyewear

Tripod mountable with optional adapter for hands-free use with reduced vibration and arm fatigue

11.8mm eye relief allows easy viewing without eye fatigue, especially during long observation sessions

5.0mm exit pupil will completely cover most pupils as they open and dilate in low light for a full and complete view without vignetting

Construction Details

Environmentally friendly Eco-Glass is made without lead and arsenic

Protective rubber armoring provides a comfortable slip-resistant grip even in cold weather

Ergonomically sculpted grips

One-piece tethered ocular rainguard protects eyecups

Objective lens caps can be clipped to neck strap to avoid losing them during observation sessions

Weight: 32-ounces

Nikon Aculon A211 10x50 bak-4 porro prism binocular