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.

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