Features
  • Fully multi-coated optics
  • BAK-4 glass prism
  • 10x magnification
  • Roof prism optical system
  • Internal focusing
  • IP67 waterproof rating
  • 50mm objective lens diameter
  • Twist-up eyecup
  • Tactical monocular
  • Rangefinding reticle

The Firefield Siege 10x50R is a tactical monocular perfect for viewing targets at long range. With fully multi-coated optics and an IP67 waterproof rating, the Siege 10x50R remains safe from outdoor elements. Featuring internal focusing and a rangefinding reticle, this tactical monocular allows for clear viewing and quick target distance identification. The Firefield Siege Monocular takes advantage of its twist-up eyecup to ensure ease of use for individuals with eyeglasses. The roof prism optical system is made from high-density BAK-4 glass, which eliminates distortion around the edge of the exit pupil when viewing.


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 - 50mm
  • Eye relief (in/mm) - .6/15.4
  • Eyecup system - Twist-up
  • Field of View (ft/1,000yds) - 367.21
  • 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-submersible to 1m/3ft
  • 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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