Oberwerk Mariner 8×40 Binoculars – Review

Astronomy Binoculars
Image Credit: Elijah Mears

Are you the sort of star gazer that likes to get off the beaten path to check out the view of the stars from the heart of the great outdoors? If so, you need a set of astronomy binoculars that provides high quality optics without a bulky, heavy housing that will weigh you down. For stargazers like you, small binoculars are the best choice, and among the many models that fall into this category, the Oberwerk Mariner 8×40 Binoculars are a true standout model.

Multi-Purpose Use

Oberwerk Mariner 8×40 Binoculars are 5.5 inches long by 6.5 inches wide, and weigh about 37 ounces, making them both compact and portable. Because of their handy size, these binoculars lend themselves to a wide variety of uses beyond astronomy, such as birdwatching and sports events, while also remaining capable of providing an impressive view of the night sky. In fact, although you can find lighter and smaller models on the market, none of its  competitors provide the same level of viewing experience or quality as these heavy-duty beauties.

An 8.4-degree field of view allows these binoculars to provide visions of distance celestial bodies over a wide viewing area, while its high contrast ratio and 40-millimeter objective lens makes it possible to see the sky in intricate detail, even if there is very little to no light available in the environment.

Waterproof Design

With the Oberwerk Mariner 8×40 Binoculars, you don’t have to worry about wet conditions or fog, as they are nitrogen purged to make them resistant to the development of water vapor, and also have an airtight seal to keep out humidity, condensation and rain. Their waterproof design makes the binoculars suitable for use close to water or even onboard a boat.

Shock Resistant

Comfortable, turning eyepieces make the Oberwerk Mariner 8×40 Binoculars perfect for all users, even those who need to wear eyeglasses to view the night sky in all of its glory. Because the binoculars are made for travel, they are highly shock resistant and feature a no-slip housing that is easy to keep hold of on the go.


Magnification: 8x
Objective Diameter: 40mm
Weight: 37 ounces
Field of View: 8.4 degrees
Exit Pupil: 5mm
Optical Coating: Fully Multi-Coated
Weather Proof: Waterproof

Final Thoughts

People who have used large astronomy binoculars may need a little time to adjust to the viewing experience with the Oberwerk Mariner 8×40 Binoculars, as they do not allow you to enjoy the full benefits of their 5-millimeter exit pupil due to an internal light baffle. This means that the 40-millimeter objective lens’ working aperture is reduced. Simply put, you need to have these binoculars in the exact right position to get an immersive viewing experience, but after a few tries you will instinctively begin to position the binoculars in the ideal location for the best view.

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