Conquering long distances is a specialty of the Brunton Eterna 51mm objective lens binocular. The benefits of big glass are often overshadowed by an enormous weight—not a problem with the Eterna. Fully multi-coated optics optimize the Eterna's light transmission for bright views on cloudy days. The Eterna is waterproof, fogproof, and built to last. Brunton covers the Eterna with a limited lifetime warranty.
Optical Features
Fully Multi-coated Lenses
Increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces. Emerald Fire™ coatings.
Phase Correction
Enhances resolution and contrast through roof prisms.
BaK-4 Prisms
Optimize light transmission.
Construction Features
Roof Prisms
Appreciated for a streamlined shape and durability.
Rubber Armoring
Provides a secure, non-slip grip.
Multi-position Eyecups
Twist up and down for comfortable viewing with or without eyeglasses.
Center Focus Wheel
Adjusts both binocular barrels at the same time.
Right Eye Diopter
Adjusts for differences in a user's eyes. Located by the right eyepiece
Tripod Adaptable
Can be mounted using standard ¼-inch threading. Adapter sold separately.
Design Features
Waterproof
Optics are sealed with O-rings to prevent moisture, dust, and debris from getting inside the binocular.
Fogproof
Barrels are filled with nitrogen gas to inhibit internal fogging.
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