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Eyeskey SkyTrek-HD 10X50 Binoculars


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● Anti-Reflection Fully Multi-coated Optics
● Phase-Corrected Compact Roof Prisms
● Compact BAK4 Roof Prisms
● Nitrogen Filled and O-ring Sealed

Optical Performance

  • High 10x magnification brings distant objects in close for detailed observations
  • Large 50mm objective lenses provide a generous light-gathering capability for improved vision in challenging conditions such as at dawn and dusk
  • Compact roof prism light path
  • BAK4 prisms deliver a round exit pupil and a crisp and clear image with limited edge distortion
  • Phase-corrected prism coatings improve color rendition and contrast
  • High-Contrast fully multi-coatings produce bright high-contrast images with neutral, natural color reproduction
  • Short 8.2-foot minimum focus distance enables detailed observations of bugs, birds, flowers, and other plants at close-range
  • 321-foot field of view at 1000 yards

Use and Handling

  • Closed-bridge configuration provides a stable and strong platform for the focusing mechanism
  • Ribbed and slip-resistant large center focusing wheel is easy to manipulate — even when wearing gloves
  • The right-eye dioptric correction allows for precise compensation to individual eye prescription
  • Long-life twist-up eyecups for comfortable use with or without eyewear
  • Tripod mountable with optional adapter helps to reduce arm-fatigue during long glassing sessions or to eliminate shake and/or vibrations
  • 17.6mm eye relief helps to reduce eye strain and improve viewing comfort during long glassing sessions
  • Comfortable 5.0mm exit pupil will completely cover most pupils as they open and dilate as the light fades

Construction Details

  • Lightweight and durable magnesium chassis reduces weight yet maintains strength and stability
  • Nitrogen-filled and O-ring sealed to be waterproof and submersible to a depth of 3.3' (1m) for up to 30 minutes and resistant to internal fogging when moving through extreme temperature changes and environmental conditions
  • One-piece tethered ocular rainguard protects eyecups from water pooling in them from rain or spraying water when hanging from the neck
  • Weight: 27.51 ounces

Prism Type Roof (BAK4)
Number of Lenses 8 Pieces 6 Groups
Objective Lens Type HD Glass
Prism Coating Phase-correction Coating
Lens Coating Fully Multi-coatings
Eyecup Type Twist-up/down
Chassis Material PPS
Weight 27.51 oz / 780g
Magnification 10 X
Objective Lens Diameter 50 mm
Eyepiece Lens Diameter 23 mm
Angle of View 6.1° (Actual)
Field of View 321' @ 1000 yd / 107 m @ 1000 m
Minimum Focus Distance 8.2' / 2.5 m
Relative Brightness 25
Twilight Index 22.36
Exit Pupil Diameter 5.0 mm
Eye Relief 17.6 mm
Diopter Adjustment Yes, Right Eye, ±3
Focus Type Center
Interpupillary Distance 56~74 MM
Fogproof Yes, Nitrogen Filled
Waterproof/b> Yes, O-ring Sealed (1 m /30 min)
Packaging Info
Package Weight 2.4 lb
Box Dimensions (LxWxH) 7.598"x 6.772"x 2.952"

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Eyeskey SkyTrek-HD 10X50 Binoculars