Siege 10x50 Monocular

SKU# FF12004

  • Sales Price:   $49.97
  • Regular price $57.47

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.

Included in Package

  • Lanyard
  • Lens covers
  • Carrying case
  • Lens cloth


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

EXPORT CONTROL NOTICE: This product is controlled for export and in-country transfer under the Export Administration Regulations (EAR). division contrary to U.S. law prohibited.

California Disclaimer

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