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Celestron SkyMaster Pro 20×80 Porro Prism Binoculars

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Celestron SkyMaster Pro 20×80 Porro Prism Binoculars

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With over 30 Years experience In the photographic industry
  • BAK4 Porro Prisms
  • XLT Fully Multi-Coated Optics
  • Wide-Angle Viewing: 64°
  • Nitrogen Filled, Waterproof & Fogproof
  • Aluminium and Polycarbonate Chassis
  • Center Focusing on Diopter Adjustment
  • Built-In Standard 1/4″-20 Tripod Mount
  • Fold-Down and Winged Eyecups
  • Detachable Rail for Finderscope

Designed as an ideal optic for wide-view astronomical or long-range terrestrial observation, the Celestron 20×80 SkyMaster Pro Binoculars feature a proprietary XLT multi-coating system to reduce reflection and increase light transmission through the entire optical system. The Porro prism configuration provides a rich depth of view and high contrast to draw users into an immersive observational experience. The combination of optical coatings, prism, and oversized 80mm objectives produces high-contrast views that are bright and crisp with accurate colour fidelity.

To help reduce weight, the binoculars’ housing is made from a combination of polycarbonate polymer and aluminium. The aluminium provides strength in key areas, while the polycarbonate is temperature resistant to limit expansion and contraction in extreme temperatures, which can cause the optical components to move out of collimation and prevent the ability to achieve sharp focus. Large objectives and long optical tubes make the SkyMaster Pro binoculars fairly heavy with a centre of gravity biased forward, so hand-holding may cause fatigue and a noticeable handshake. A centre stabiliser bar has a built-in 1/4″-20 tripod adapter to mount the instrument, with a detachable rail for a red-dot finderscope. To handle a wide range of environments, the optical tubes are nitrogen-filled and O-ring sealed to be waterproof and fog proof.

Optical Performance

  • 20x magnification
  • 80mm objective lenses
  • BAK4 Porro prism optical path
  • Proprietary XLT fully multi-coated optics increase light transmission for bright high-contrast images
  • 168′ field of view at 1000 yards
  • 64° wide-angle viewing
  • 15.5mm eye relief, 4.0mm exit pupil

Use and Handling

  • ±4 dioptric correction
  • 56 to 72mm interpupillary adjustment range
  • Detachable RSR (Reflex Sight Ready) rail for attaching an optional red-dot finderscope
  • Traditional fold-down eyecups for comfortable use with or without eyewear
  • Includes winged eyecups to block stray peripheral light that can affect vision

Construction Details

  • Lightweight and durable polycarbonate and aluminium chassis
  • Nitrogen filled for water and fog proof performance
  • Rubber armour protects against impacts and provides a slip-resistant grip
  • Built-in tripod adapter for easy mounting


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Prism Type Porro (BAK4)
Magnification 20x
Objective Lens Diameter 80 mm
Angle of View 3.2° (Actual)
Field of View 168′ @ 1000 yd / 56 m @ 1000 m
Minimum Focus Distance 66.2′ / 20.18 m
Exit Pupil Diameter 4 mm
Eye Relief 15.5 mm
Interpupillary Adjustment 56 to 72 mm / 2.2 to 2.8″
Diopter Adjustment -4 to +4
Focus Type Center
Fogproof Yes, Nitrogen Filled
Water Resistance Waterproof
Dimensions 13 x 9.5 x 4″ / 33 x 24.1 x 10.2 cm
Weight 5.4 lb / 2.4 kg
Packaging Info
Package Weight 9.3 lb
Box Dimensions (LxWxH) 17 x 13.1 x 7.5″

  • Removable Finder Rail
  • 2 x Winged Eyecups
  • Ocular Rainguard
  • 2 x Objective Caps
  • Neck Strap
  • Lens Cloth
  • Case

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