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Pentax 10x25 U-Series UP Waterproof Compact Binocular

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Product Description


  • BAK4 Porro Prisms
  • Fully Multicoated Optics
  • Angle of View: 50°
  • Nitrogen-Filled, Water and Fogproof
  • Reinforced Polycarbonate Housing
  • Synchronized Eyepiece Adjustment
  • Center Focusing
  • Standard 1/4"-20 Tripod Mount
  • Twist-Up Eyecups


Pentax's highly portable and functional 10x25 U-Series UP WP Compact Binocular employs an innovative unibody design that locks the objective lenses into the body with the eyepieces set on a synchronized dual-axis mechanism that ensures they stay symmetrical in relation to the center axis of the optic when adjusting the interpupillary distance. The 25mm objective lenses are fully multicoated to reduce reflection and maximize light transmission to produce the brightest images possible. Aspherical lens elements virtually eliminate distortion, especially around the edges, and corrects for lens astigmatism which can prevent sharp focusing.


Designed for easy carrying and stowing, the binocular features a lightweight fiberglass reinforced polycarbonate housing that is corrosion and impact resistant. The housing material is also temperature-resistant allowing for its use in extreme climates while reducing expansion and contraction wide temperature variations can cause, which can make the optical components move out of collimation over time. Its optical tubes are nitrogen-filled and O-ring sealed so they can are submersible to 3.3', as well as fogproof in all weather conditions.

Optical Performance
  • 10x magnification
  • 25mm objective lenses
  • BAK4 porro-prism optical design
  • Aspherical lens elements reduce distortion at the edges and corrects for lens astigmatism which can prevent sharp focusing
  • Anti-reflection fully multicoated optics
  • 262.5' field of view at 1000 yards
  • 50° angle of view
Use and Handling
  • Dual-axis synchronized eyepiece adjustment ensures symmetrical placement when changing interpupillary distances
  • Knurled center focus wheel
  • Twist-up eyecups for use with or without eye wear
  • 15mm eye relief, 2.5mm exit pupil
  • Standard 1/4"-20 tripod mount
Construction Details
  • Lightweight fiberglass reinforced polycarbonate housing
  • Housing is corrosion, temperature and impact-resistant
  • Nitrogen-filled for fogproof performance, submersible to 3.3' (1m)
  • Rubberized armoring protects against impacts and provides slip-resistant grip
  • Inner focusing mechanism provides smooth focus while preserving waterproof seals



Prism Type




Objective Lens Diameter


Angle of View

5.0° (actual)


262.5' @ 1000 yd / 87.15 m @ 1000 m

Minimum Focus Distance

6.3' / 1.92 m

Exit Pupil Diameter

2.5  mm

Eye Relief

15  mm

Interpupillary Adjustment

Not specified by manufacturer

Dioptric Correction

Not specified by manufacturer

Focus Type


Tripod Mount



5.6 x 4.4 x 2.7" / 14.22 x 11.18 x 6.86  cm


12.3 oz / 348.7 g


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