• BAK-4 glass prism
  • Waterproof and fogproof
  • Twist-up eyecup
  • Fully multi-coated optics
  • 10x magnification
  • IP67 waterproof rating
  • Built-in tripod adapter
  • Internal focusing

The Firefield Siege 10x50 Monocular gets you up close and personal with 10X magnification and a robust 50mm objective lens designed for incredible light transmission and a crystal clear field of view even when dusk sets in. With IP67 waterproof protection and a rubber armored body, the Siege is ready for outdoor action no matter how tough the adventure. This BAK4, roof prism Firefield Siege 10x50 Monocular is compact enough to fit easily in a cargo pocket or backpack but delivers big enough on performance, with standard ¼-20 screw mount compatibility, to be your on-the-go spotting scope. Additional features include a field of view of 367 ft. at 1,000 yards, twist-up eyecup and an internal focusing lens. The Firefield Siege 10x50 Monocular includes lens covers, a carrying case, a lens cloth and a protective carrying case.

The ECCN, USML Category, or European Dual Use/Military designation, provided by Sellmark, is advisory. All advisory information reflects an interpretation of the U.S./European export laws and regulations, and is subject to change without notice. It is the obligation of the exporter requesting the advisory information from Sellmark to comply with all applicable export control laws and regulations. Sellmark makes no representation as to the accuracy or reliability of the export control classification information, and is in no way responsible for any damages or penalties suffered by any other party as a result of using or relying upon such information.

Please refer to the Export Compliance page for more information.

  • Body Material - Plastic/rubber
  • Close Focus Distance - 13/4
  • Diameter, Exit Pupil - 5.6
  • Diameter, Objective Lens - 50
  • Eye relief (in/mm) - .6/15.4
  • Eyecup system - Twist-up
  • Field of View (ft/1,000yds) - 367
  • Field of View (m/1,000m) - 122
  • Field of View, degree - 7
  • Focusing Lens, Eye/Obj/Int - Internal
  • Fog Proof - Yes
  • Height (in/mm) - 2.6/66
  • IP Rating (waterproof) - IP67-waterproof up to 1m/3ft for 1 hour
  • Length (in/mm) - 6.2/157
  • Lens Coating - Fully multi-coated
  • Magnification - 10
  • Operating temperature, F/C - 0 to 120 / -17 to 49
  • Prism Coating, (yes/no) - Yes
  • Range, Diopter - 0
  • Relative Brightness - 22.4
  • Resolution - 2.3
  • Twilight Index - 31.4
  • Type of Prism (type) - Roof/BAK4
  • Waterproof/Nitrogen-filled - Yes
  • Weight, oz - 15.2
  • Width (in/mm) - 2.2/56

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