The Eterna Compact binocular by Brunton is built with BaK-4 prism glass and twist-up eyecups, all in 12 ounces.
FEATURES of the Brunton Eterna Compact Binoculars BaK-4 prism glass State-of-the-art phase coating AL reflective coating Emerald Fire full multi-coating Multi-step eye relief system Waterproof Nitrogen filled/fog proof Ergonomic body armor The SPECS Weight: 12 oz Objective Diameter: 25 mm Overall Dimension: 4.8 x 3.8 x 1.8" Twist Up Eye Relief Type: Multi-step Prism Glass Type: BaK-4 Phase Coating: Yes Prism Coating: AL Lens Coating Type: Full multi Waterproof: Yes Fogproof / Nitrogen Filled: Yes Includes: BinoGlove and neoprene neck strap The SPECS for 8 x 25 Power: 8x Close Focus Distance: 6 feet Exit Pupil: 3.1 mm Eye Relief: 18.5 mm Field of View at 1000 yards: 270 feet The SPECS for 10 x 25
Power: 10x Close Focus Distance: 8 feet Exit Pupil: 2.5 mm Eye Relief: 17 mm Field of View at 1000 yards: 260 feet
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