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Nikon 12x50 Aculon A211 Binocular (Black) Bak-4 porro prism 


Optical Performance

Powerful 12x magnification allows for highly detailed observations of distant subjects

Large 50mm objective lenses improve light-gathering ability to ensure distant views remain bright and sharp for better resolution, even in challenging light conditions

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

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

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

Fold-down rubber eyecups for comfortable use with or without eyewear

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


  • Magnification (x)
    • 12
    • Objective diameter (mm)
    • 50
    • Real field of view (°)
    • 5.2
    • Apparent field of view (°)
    • 57.2
    • Field of view @ 1000m (m/ft)
    • 91/272
    • Exit pupil (mm)
    • 4.2
    • Brightness
    • 17.6
    • Eye relief (mm)
    • 11.5
    • Close focus ditance (m/ft)
    • 8.0/26.2
    • Interpupillary distance adjustment (mm)
    • 56-72
    • Length (mm/inch)
    • 179/7.0
    • Width (mm/inch)
    • 197/7.8
    • Weight (g/oz)
    • 910/32.1

Nikon 12x50 Aculon A211 Binocular (Black) Bak-4 porro prism


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