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Pentax SP 8x40 WP Binoculars

The Pentax SP 8x40 WP binoculars was created for heavy duty applications. The rubber armoured waterproof and nitrogen-purged body withstands weather, dust or rough impact.

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Product Code: 65871


The Pentax SP 8x40 WP binoculars was created for heavy duty applications. The rubber armoured waterproof and nitrogen-purged body withstands weather, dust or rough impact. Add high imaging capability and you have a binocular that will accompany you to the extremes, on land or on water!

Fully-multi-coated optics

Fully multi-coated lenses serve the essential purpose of maximizing the amount of light passing through a lens, thereby prevent flare and ghosting from interfering with your view. Pentax applies multiple layers of coatings to every surface of every element and prism in the full Sport Optics line-up. These fully-multi-coated optics assure the maximum light transmission resulting in a clear, crisp view of the world.

Protective Lens Coatings

All optical surfaces are delicate and must be handled with care to prevent scratching. To add to the durability of the Z- and S-series Water Proof binoculars, Pentax has added a protective, nano technology coating that helps defl ect water, oil, dust and dirt. This allows Pentax binoculars to withstand the harshest viewing conditions.

BaK4 prisms

Due to its outstanding refractive index, the BaK4 glass prism found in all Pentax Sport Optics is highly acclaimed for its perfectly round exit pupil and clear, unvignetted image.

Phase Correction

The complex optical design of roof prism binoculars provide durable, compact, yet lightweight design but require a higher level of optical perfection. A phase-correction coating is applied in the full range of roof prism binoculars to maximize image viewing quality.


Pentax waterproof products are fully sealed and purged with laboratory grade nitrogen to provide a fog proof view in the harshest weather conditions. With a JIS Class 6 rating, Pentax waterproof binoculars can even be submerged in up to 3 feet of water.

Unique Hydrophobic Coating

Water droplets on a lens have a negative influence on the ability of light to enter the objective lens. By using a unique water repellent coating on all outer lenses we make water drops “bead” into small, deformed droplets. The deformed droplets cause less distortion and “slide” more easily off the lens. Your binocular remains fully functional even in rain, snow, fog or condensing breath.

Aspherical lens elements

Edge-to-edge sharpness is a vital element to comfortable viewing. To achieve this, Pentax utilise aspherical lens elements in our eyepieces. This is a specially shaped lens design that reduces aberration to a minimum.

Nitrogen purged

Nitrogen is a chemical element and a colorless, odorless and tasteless gas. It contains very little humidity and is therefore used to “purge” binoculars and spotting scopes of the high humidity air that is part of our environment. Due to the low humidity factor, nitrogen prevents condensation from forming on the internal lenses of optical instruments during phases of rapid temperature change. Furthermore, because nitrogen is purged into the optical instrument at slightly above atmospheric pressure, dust and other miniscule particles are prevented from entering the housing.

Long eye relief design

The long eye relief offered in all Pentax Sport Optics allows the viewer to see the entire field of view clearly and effortlessly. This is especially beneficial to eyeglass wearers, and allows viewing for extended periods of time without added eye strain.

Superb impact resistance

The body is made from magnesium, which adds toughness while keeping the binoculars light. In addition, the exterior rubber coating provides the binoculars with superb resistance to shocks and impacts.

Pentax SP 8x40 WP Binoculars Features:

  • Fully multi-coated optics.
  • Phase correction.
  • Protective lens coating
  • Waterproof.
  • Nitrogen purged
  • Unique hydrophobic coating.
  • Aspherical lens elements.
  • Magnesium alloy construction.

Pentax SP 8x40 WP Binoculars Specification:

Objective Diameter:
Exit Pupil:
Eye Relief:
Close focus:
Field of View:
136 x 178 x 76mm.
30 Years.
Included Accessories:
Objective and eyepiece caps, case, strap.


Magnification 8x
Objective Diameter 40mm
Field of view 110m/1000m
Angle of view 6.3°
Waterproof Yes
Warranty Period 30 Years

Bundle Offers


  • 1*Pentax SP 8x40 WP Binoculars + 1*Sigma Micro Fibre Lens Cloth - 31 x 31 cm

    £155.99 £154.24

    save £1.75

    on accessories
    When buying this bundle

    Sigma Micro Fibre Lens Cloth - 31 x 31 cm


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