Pentax SP 8x40mm WP Binoculars

Pentax SP 8x40mm WP Binoculars
Pentax SP 8x40mm WP BinocularsPentax SP 8x40mm WP BinocularsPentax SP 8x40mm WP Binoculars
Pentax SP 8x40mm WP BinocularsPentax SP 8x40mm WP BinocularsPentax SP 8x40mm WP Binoculars


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Model:  pntx_sp_8x40_wp_65871
Part Number:  65871
Brand:  Pentax
Type:  Classic
Style:  Porro
Magnification:  8x
Aperture:  40mm
Colour:  Black
Features:  Waterproof
Prism Type:  Porro Prism


  • SP WP Binoculars
  • Objective Lens Caps
  • Eyepiece Lens Caps
  • Carrying Case
  • Neck Strap
  • Lens Cloth
  • Instruction Manual

Pentax S-Series

NEW updated Pentax S-series porro-prism binoculars with newly developed light transmission coatings and a hydrophobic coating (rain drops roll off) on the outer optics.

Provides bright, high contrast views in low light and the modern waterproof waterproof construction makes them an excellent choice for use in rough outdoor conditions. 

The rubber armoured waterproof and nitrogen-purged body withstands weather, dust or rough impact. 


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

New Fully-multi-coated optics

Fully multi-coated lenses serve the essential purpose of maximising
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 Coating

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 deflect 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.

PENTAX Waterproofing

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, we 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 colourless, odourless 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.

Other Features

Helicoid three-stop eyepiece rings that permit fine adjustment for maximum viewing comfort 

Product Specifications

Product Code65871
TypeFull-size Porro
Objective Lens Diameter40 mm
Field of View at 1000m110 m
Exit pupil aperture5 mm
Eye Relief20 mm
EyecupsMulti-Stop Twist-Up
Height76 mm
Width178 mm
Depth136 mm
Weight850 g
Water proofYes (JIS Class 6) Nitrogen purged
AccessoriesObjective and eyepiece caps, case, strap
Prism coatingBaK4
Lens coatingFully multi-coated optics, Protective lens coating
Twilight Factor17.9
Close focus3.5 m
Tripod AdaptorWith adapter N PENTAX Code No. 69553

Pentax SP 8x40mm WP Binoculars Questions & Answers

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Q1. How much do these binoculars weigh?

The Pentax SP 8x40mm WP binoculars weigh approximately 850g / 29.98oz.

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December 2017 / View Older
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