Features
  • Roof prism optical system
  • Fully multi-coated optics
  • Waterproof and fogproof
  • Twist-up eyecup
  • Internal focusing
  • Built-in tripod adapter

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.


Export of the commodities described herein is strictly prohibited without a valid export license issued by the U.S. Department of State Office of Defense Trade Controls prescribed in the International Traffic in Arms Regulation (ITAR). Title 22, Code of the Federal Regulation, Parts 120-13.

  • 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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