Key Features

• Phase-Corrected BAK4 Roof Prisms
• Fully Multi-Coated Optics
• Wide 65° Viewing Angle
• Nitrogen-Filled, Water and Fog-proof

Styrka's 10x42 S3-Series Binoculars are engineered with complementary technologies to produce an optic that is built to perform in the harshest conditions. Their BAK4 roof prisms are phase-corrected and dielectric coated which limit internal light loss and diffraction, reduce chromatic aberration and halos, while improving image contrast. The optical path is fully multi-coated with their proprietary SXL anti-reflection coatings to further increase light transmission, image contrast and sharpness, and provide true colour rendition. This all translates to bright and clear high-contrast images with accurate colour across the entire wide field of view. The wide view, combined with the moderate magnification, produces an expansive and immersive observational experience.

To hold up to a lifetime of outdoor use, the optical tubes are nitrogen-filled and O-ring sealed to make them not only fog-proof when moving between extreme temperatures, but also waterproof and submersible to 3.3' for up to 30-minutes. The exterior has black rubberised Armor that protects against knocks and drops, and offers a slip-resistant grip for sure handling in cold and wet conditions. Styrka includes a one-piece ocular rain-guard and tethered objective lens covers, plus a binoculars' harness that keeps the binoculars close to the body while moving to eliminate snags and swing, and relieve neck strain by redistributing the weight to the shoulders.

Optical Performance

• 10x magnification
• 42mm objective lenses
• Compact BAK4 roof prisms
• Proprietary anti-reflection SXL fully multi-coated optics improve light transmission, colour fidelity, and image contrast
• Phase-corrected prism coatings increase contrast while eliminating colour fringing and halos
• Dielectric coated prisms reduce internal light diffraction and improve light transmission through the prismatic light path
• 341' field of view at 1000 yards
• Wide 65° apparent angle of view
• Long 15.2mm eye relief
• Comfortable 4.2mm exit pupil

Use and Handling

• Closed-bridge configuration
• Large centre focusing wheel
• ±4 right-eye dioptric correction
• 56-75mm inter-pupillary adjustment range
• Twist-up rubber eye-cups for comfortable use with or without eye-wear
• Tripod mountable with optional adapter

Construction Details

• Slip resistant black rubberised armouring
• Nitrogen-filled provide fog-proof performance when moving between extreme temperature changes
• IPX7-rated, O-ring sealed to be submersible to 3.3' (1m) for 30 minutes
• Includes 1-piece ocular rain-guard and two tethered objective lens covers
• Weight: 23.1 ounces

Specification

Prism Type	Roof (BAK4)
Magnification	10x
Objective Lens Diameter	42 mm
Angle of View	6.5° (Actual)
Field of View	341.2' @ 1000 yd / 113.7 m @ 1000 m
Minimum Focus Distance	6.6' / 2 m
Exit Pupil Diameter	4.2 mm
Eye Relief	15.2 mm
Inter-pupillary Adjustment	56 to 75 mm / 2.2 to 3"
Diopter Adjustment	-4 to +4
Focus Type	Centre
Fog-proof	Yes, Nitrogen Filled
Water Resistance	Waterproof
Dimensions	5.7 x 5 x 2.2" / 14.5 x 12.7 x 5.6 cm
Weight	23.1 oz / 654.9 g