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Eyeskey Seeker-Pro 8X42 Monocular


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● Compact BAK4 Roof Prisms
● Fully Multi-Coated Lenses
● Nitrogen Filled, Water and Fogproof
● Lightweight Polycarbonate Chassis


With a generous objective lens, a stable image, and housing designed to withstand the elements, the Seeker-Pro 8X42 monocular is suited to birding, hiking, hunting, travel, sightseeing, concerts, sports, theater – anywhere you want a good look at distant details. The Seeker's 8x magnification has plenty of power for long-range observations but is less susceptible to image shake than higher powered optics, and the 42mm objective has light-gathering power for a bright image even at low-light times such as dawn and dusk. This combination of magnification and objective size yields a wide 58° apparent angle of view – that's nearly 370 feet at 1,000 yards. This monocular also offers a very useful close-focus distance of just 20 feet.

A built-in utility clip makes it easy to hang the monocular on a belt, strap, or pocket when you need your hands free. The rubber-armored housing is O-ring sealed to keep out water and dust, and it is also purged with nitrogen to prevent internal fogging no matter the conditions. The twist-up eyecup and 18mm eye relief make the monocular comfortable for people who wear eyeglasses. And at 5.7 x 2.3", it's easy to carry and store.

Optical Performance

  • 8x magnification
  • 42mm objectives provide bright images in most lighting conditions
  • Roof prism for a compact form factor
  • Fully multi-coated optics improve light transmission, increase contrast, and produce true color fidelity
  • 368.4' field of view at 1000 yards

Use and Handling

  • Easy focusing collar around the eyepiece
  • Twist-down eyecup for a full field of view when wearing eyeglasses
  • Comfortable 17.1mm eye relief
  • Wide 5.2mm exit pupil

Construction Details

  • Environmentally-friendly lead-free glass
  • Nitrogen-filled for water and fog-proof performance - even with extreme temperature variations
  • Durable armoring provides a slip-resistant grip
  • Weight: 14.07 ounces

Prism Type Roof (BAK4)
Number of Lenses 8 Pieces 6 Groups
Objective Lens Type HD Glass
Prism Coating MgF2 Coated
Lens Coating Fully Multi-Coatings
Eyecup Type Twist-up/down
Chassis Material PPS
Weight 11.96 oz / 339 g
Magnification 8 X
Objective Lens Diameter 42 mm
Eyepiece Lens Diameter 23 mm
Angle of View 7.0° (Actual)
Field of View 368.4' @ 1000 yd / 122.8 m @ 1000 m
Minimum Focus Distance 19.69' / 6 m
Relative Brightness 27.04
Twilight Index 18.33
Exit Pupil Diameter 5.2 mm
Eye Relief 17.1 mm
Focus Type Manually
Fogproof Yes, Nitrogen Filled
Waterproof/b> Yes, O-ring Sealed (1 m /30 min)
Packaging Info
Package Weight 0.84 lb
Box Dimensions (LxWxH) 6.772"x 4.134"x 3.307"
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Eyeskey Seeker-Pro 8X42 Monocular