BAK4 Porro Prism, Fully Multicoated Optics, Angle of View: 50°
Our Price $329.00


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Designed for a lifetime of rugged outdoor use Pentax 's 8x40 S-Series SP WP Binocular can be used with confidence in all weather and lighting conditions. The 40mm objectives are fully multicoated to reduce reflection and maximise light transmission through the entire optical path without making them overly cumbersome for a long day on the trail. Utilising the traditional porro prism configuration gives scenes a rich depth of view for an immersive observation experience and provides a comfortable feel in the hand with a lot of surface area to maintain a sure grip. The coatings ensure bright and clear high-contrast images even in low-light, and its utilitarian 8x magnification brings subjects close while maintaining 363' field of view to preserve situational awareness.

Complementing the optical performance are construction details made for the trail. The optical tubes are nitrogen-filled and O-ring sealed for fogproof performance and to make them submersible to as much as 3.3'. The binocular sports a generous 20mm eye relief and the fold-down eyecups seal against the ocular cavity to block stray peripheral light which can dim images.

Key Features

Optical Performance
  • 8x magnification
  • 40mm objective lenses
  • BAK4 porro prism optical path
  • Anti-reflection fully multicoated optics
  • 331' field of view at 1000 yards
  • 50° angle of view
Use and Handling
  • Closed bridge configuration
  • Large knurled centre focus wheel
  • Right-eye dioptre adjustment
  • 20mm long eye relief, 5.0mm exit pupil
  • Fold-down rubber eyecups seal against ocular cavity and block stray peripheral light
Construction Details
  • Rubberised armouring protects against impacts and provides slip-resistant grip
  • Nitrogen-filled, fogproof and submersible to 3.3' (1m)
  • Internal focusing system helps to maintain waterproof seals
  • Tripod mountable with optional adapter

Specifications

Prism TypePorro
Magnification8x
Objective Lens Diameter40mm
Angle of View6.3° (actual)
Field-of-View330.8' @ 1000 yd / 109.83 m @ 1000 m
Minimum Focus Distance11.6' / 3.54 m
Exit Pupil Diameter5.0  mm
Eye Relief20  mm
Interpupillary AdjustmentNot Specified By Manufacturer
Dioptric CorrectionNot Specified By Manufacturer
Focus TypeCentre
Tripod MountYes (Adapter Optional)
Dimensions7.0 x 5.4 x 3.0" / 17.78 x 13.72 x 7.62  cm
Weight31.8 oz / 902 g
Product:
Pentax 8x40 S-Series SP WP Binocular
Manufacturer:
Pentax
Model:
65871
SKU:
65871
RM Product #:
31920