Pentax SP 50mm WP Binoculars

Pentax SP 50mm WP Binoculars
Pentax SP 50mm WP BinocularsPentax SP 50mm WP BinocularsPentax SP 50mm WP Binoculars
Pentax SP 50mm WP BinocularsPentax SP 50mm WP BinocularsPentax SP 50mm WP Binoculars
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Model:  pntx_sp_12x50_wp_65873
Part Number:  65873
Brand:  Pentax
Type:  Classic
Style:  Porro
Magnification:  10x / 12x
Aperture:  50mm
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

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
  • 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 Code6587265873
TypeFull-size PorroFull-size Porro
Objective Lens Diameter50 mm50 mm
Field of View at 1000m87 m73 m
Exit pupil aperture5 mm4.2 mm
Eye Relief20 mm20 mm
EyecupsMulti-Stop Twist-UpMulti-Stop Twist-Up
Height79 mm79 mm
Width183 mm183 mm
Depth178 mm178 mm
Weight1.060 g1.080 g
Water proofYes (JIS Class 6) Nitrogen purgedYes (JIS Class 6) Nitrogen purged
AccessoriesObjective and eyepiece caps, case, strapObjective and eyepiece caps, case, strap
Prism coatingBaK4BaK4
Lens coatingFully multi-coated optics, Protective lens coatingFully multi-coated optics, Protective lens coating
Twilight Factor22.424.5
Close focus5.5 m5.5 m
Tripod AdaptorWith adapter N PENTAX Code No. 69553With adapter N PENTAX Code No. 69553

Pentax SP 50mm WP Binoculars Questions & Answers

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Q1. How much do these binoculars weigh?

The Pentax SP 10x50mm WP binoculars weigh approximately 1,060g / 37.39oz and the SP 12x50mm WP binoculars weigh aproximately 1,080g / 38.1oz.

Average Rating (1 Review):  
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Rating (max 5):  
Tuesday, 20 February 2018  | 

Very pleased with these binoculars. Very well made and superb for astronomy use.

Customer Services Report
December 2017 / View Older
Positive Feedback read all 4830 comments
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