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Compact black roof-prism binoculars with centre focus wheel and 28 mm objective lenses

PENTAX

PENTAX 62831 AD 9x28mm Waterproof Binocular

SKU CH-Q26V-KX9JE

Waterproof 9x28 roof-prism binoculars with 5.6-degree field of view and nitrogen-purged JIS Class 6 sealing

  • TypeBinoculars
  • SpecificationsAD 9x28 WPProduct Type: Roof Prism, Center Focus, Waterproof
  • Field of Viewat 1000m-98 m
  • Objective Lens28
  • Total Magnification9
  • FeaturesWater proof: Yes (JIS Class 6) – Nitrogen purged
  • 9× magnification brings distant subjects close
  • 28 mm objective lenses gather ample light
  • 6° real field of view captures wide scenes
  • 98 m field of view at 1000 m tracks moving targets
  • Waterproof JIS Class 6 and nitrogen-purged for fog-free use

Pentax 9x28 Waterproof Roof Prism Binoculars

The Pentax 62831 AD combines 9x magnification with a 28mm objective lens in a roof prism design. Nitrogen purging and JIS Class 6 waterproofing protect the optics during outdoor activities such as birdwatching and hiking. The fiber-reinforced polycarbonate chassis keeps the unit rigid and lightweight for extended field use. Multi-layer lens coatings maximise light transmission for bright, true-to-life images.

Sustained outdoor use in wet conditions

The waterproof construction maintains optical performance during prolonged exposure to rain or humidity without internal fogging. Nitrogen purging prevents condensation buildup when temperatures shift during long observation sessions. The durable polycarbonate body resists wear from repeated handling and transport. Center focus adjustment remains smooth and precise throughout extended viewing periods.

9x magnification with 5.6° field of view

Fixed 9x power delivers a real field of view of 5.6 degrees, equivalent to 98 metres at 1000 metres distance. Close focus begins at 10 feet for detailed near-subject observation. Buyers needing higher magnification for distant wildlife or wider fields for scanning large areas should consider other configurations. The 28mm objective limits low-light brightness compared to larger aperture models.

Highlights

  • 9× magnification brings distant subjects close
  • 28 mm objective lenses gather ample light
  • 6° real field of view captures wide scenes
  • 98 m field of view at 1000 m tracks moving targets
  • Waterproof JIS Class 6 and nitrogen-purged for fog-free use

Specifications

BrandPENTAX
Model62831
TypeBinoculars
SpecificationsAD 9x28 WPProduct Type: Roof Prism, Center Focus, Waterproof binocularFocusing Range: 10 feet – infinityPrism: RoofObjective Lens Diameter: 28mmSpecifications: 9XReal Field Of View: 5.6 degreesField Of View At 1000m: 98 metersBinocular Type: Roof PrismField Of View At 1000y: 323.4 feetExit Pupil: 3.1mmEye Relief: 18mmRelative Brightness: 9.6Eyepiece Ring: HelicoidBody Color: GreenHeight Width: 4.6x4.52 inchesThickness: 1.73 inchesWeight: 12.8 ouncesWaterproof: YesMinimum Focusing Distance: 10 feet
Field of Viewat 1000m-98 m
Objective Lens28
Total Magnification9
FeaturesWater proof: Yes (JIS Class 6) – Nitrogen purged

Questions about this item

Does the roof-prism binocular fog up or overheat during all-day use?

The nitrogen-purged, JIS Class 6 waterproof body prevents internal fogging, and the passive optical design generates no heat during extended viewing.

What must I already own for the 62831 to work?

Nothing — the centre-focus roof-prism binocular is a self-contained optical instrument that requires no batteries, mounts or external devices.

How does the 5.6-degree field of view compare with older 7x porro models I might keep?

At 98 metres wide at 1000 metres, the 9x28 roof-prism gives a broader angular view than most vintage 7x porro glasses while maintaining a compact profile.

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