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Pentax 62831 AD 9x28 WP Compact Binoculars — main product image
Pentax 62831 AD 9x28 WP Compact Binoculars
Pentax 62831 AD 9x28 WP Compact Binoculars
Pentax 62831 AD 9x28 WP Compact Binoculars
Pentax 62831 AD 9x28 WP Compact Binoculars
Pentax 62831 AD 9x28 WP Compact Binoculars
Pentax 62831 AD 9x28 WP Compact Binoculars
Pentax

Pentax 62831 AD 9x28 WP Compact Binoculars

★★★★★4.6 (238 reviews)

Waterproof 9x28 compact binoculars with roof prism optics that deliver full-size clarity in a pocket-friendly design.

$150.77*$151.00Save 0%
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Pentax AD 9x28 WP binoculars are designed for outdoor enthusiasts who want capable optics without the bulk and weight of full-size models. At just 115mm wide, 117mm deep, and 44mm tall, they are one of the more compact options available with 9x magnification, making them easy to carry during hikes, travel, birdwatching outings, and sporting events. The roof prism optical design keeps the barrel profile slim and straight, contributing to both the compact dimensions and a comfortable, natural grip.

The waterproof construction is a standout feature at this size class, giving users confidence to bring these binoculars along in unpredictable weather without worrying about moisture infiltrating the optics. The 28mm objective lenses provide a 3.1mm exit pupil and a 98-meter field of view at distance, delivering a bright, wide image in good lighting conditions. While the smaller objective lenses do trade away some low-light performance compared to larger 32mm or 42mm binoculars, the gain in portability is substantial. For users who prioritize having binoculars they will actually carry every time they head outdoors, the Pentax AD 9x28 WP makes a compelling case as a reliable, weather-sealed everyday optic.

Key Features

Pentax AD 9x28 WP. Magnification: 9x

Lens diameter: 2.8 cm

Prism type: Roof. Width: 115 mm

Depth: 117 mm

Height: 44 mm

Specifications

Magnification
9x
Objective Lens Diameter
28mm
Prism Type
Roof
Exit Pupil
3.1mm
Field of View
98m
Waterproof
Yes
Width
115mm
Depth
117mm
Height
44mm
Color
Black

Pros & Cons

👍 Pros

  • Genuinely compact and lightweight design fits comfortably in a pocket, unlike bulkier full-size binoculars.
  • Waterproof construction allows confident use in rain and wet outdoor environments.
  • 9x magnification provides strong detail at distance without excessive image shake from hand movement.
  • Roof prism design contributes to the slim, straight-barrel body that is easier to grip and store.

👎 Cons

  • 28mm objective lenses gather less light than larger 32mm or 42mm models, limiting low-light and dusk performance.
  • 3.1mm exit pupil is relatively small, which can make the image appear dimmer in anything less than good lighting.
  • No listed eye relief specification, which may be a concern for eyeglass wearers who need adequate clearance.
  • 9x magnification without image stabilization can show noticeable hand shake during extended viewing sessions.

Frequently Asked Questions

Yes, the WP designation means they are waterproof, making them suitable for use in rain and wet conditions without worrying about moisture damage to the internal optics.
The 9x refers to the magnification power — objects appear nine times closer than with the naked eye. The 28 refers to the objective lens diameter in millimeters, which affects how much light the binoculars gather.
With dimensions of 115mm wide, 117mm deep, and just 44mm tall, they are small and light enough to carry in a jacket pocket or a small bag, making them well suited for hiking, travel, and events.
The 3.1mm exit pupil performs well in daylight and moderate light conditions. In very low light such as dusk or dense forest, a larger exit pupil from bigger objective lenses would gather more light.

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