Brunton Eterna Compact Binoculars 10×25

By: Jenn K.

This product was provided by the manufacturer for the purpose of this review.

Brunton Eterna Compact The Brunton Eterna Compact Binoculars are phase coated binoculars that are compact in design.  They provide a 260 foot field of view at 1,000 yards. They also provide sharp images at a range as close as 8 feet.

These binoculars come with custom neoprene covers to protect the lenses for transport and storage, a neck strap, cleaning cloth, and an instruction booklet.

These Eterna Compact Binoculars have BaK-4 prism glass. And from my reading, prism glass is recommended for the best image when viewing through binoculars. The lenses are fully coated which help tone down reflective sunlight, sharpen edges, protect colors, and give a crisp resolution.

The binoculars are filled with nitrogen to prevent internal fogging. If there is fogging internally the manufacturer should be contacted for repair.  They are designed to withstand rain, snow, and a brief submersion in water. The binoculars can be lightly rinsed in water and dried with a lint free cloth; this will not damage the binoculars. It is recommended to keep the lenses clean by using the included cloth; by using a circular motion.

Brunton Eterna Compact Binoculars
With Bino Gloves

The lens covers are named Bino Gloves by the manufacturer. The Bino Gloves can also be snapped to the neck strap to keep them close by (or prevent them from getting lost) while out in the field. The neck strap is designed to be attached to the binoculars through the strap hooks before covering the lenses with the Bino Gloves. The neck strap can also be detached or fastened quickly in the field by the plastic connectors on the strap.

There are twistable eyecups on these binoculars that are easy to use. It is recommended to use the eyecups in the up position when not wearing eyeglasses. When wearing eyeglasses it is recommended to have the eyecups in the down position. The right eye on the binoculars has a diopter adjustment for right eye alignment.

Brunton Eterna Compact Eyecups
Brunton Eterna Compact Eyecups

The Eterna Compact Binoculars were easily adjusted for my first use. I used a building down the street for set-up purposes. I was not wearing glasses so I had the eyecups in the up position. I first set up the distance between my eyes by moving the barrels until the two images merged together. I blocked the light through the right lens with my hand. I then focused the binoculars using the focus wheel. I removed the binoculars from my eyes for a brief rest. I then covered the left lens with my hand and focused the diopter. I had a crisp, clear image of the building. Looks like I am familiar enough with the set-up of the binoculars to use them in the field.

Features of the Brunton Eterna Compact Binoculars:

Brunton Eterna Compact With Neck Strap
With Neck Strap
  • Power: 10 X
  • Objective Diameter: 25 mm
  • Overall Dimensions: 4.8 x 3.8 x 1.8 inches
  • Weight: 12 ounces
  • Frame material: Aluminum
  • Close focus distance: 8 feet (noted in the booklet)
  • Exit pupil: 2.5 mm
  • Eye relief: 17 mm
  • Twist up eye relief type: Multi-step
  • Field of view at 1000 yards: 260 feet
  • Prism type: BaK-4
  • Prism coating: AL reflective coating
  • Phase coated
  • Emerald Fire full multi-lens coating
  • Waterproof
  • Fog-proof
  • Nitrogen filled


These binoculars are not tripod compatible.


Update 12/12/11

The Brunton Eterna Binoculars have been used for the past month at the beach and on nature hikes. I had the opportunity to also take them with me biking at Limestone Canyon in Southern California.  I used the binoculars without my prescription eyeglasses, but I was wearing sunglasses most of the time. I was able to easily adjust the eye cups between the settings for wearing glasses. There was no need for me to change the initial settings of the binoculars as the images were crisp and clear.

Thus far I am very pleased with these binoculars. They are not overly heavy and provide a crisp and clear viewing.  I was able to view seals in the ocean, pelicans and other birds at the beach, owls, raptors, and deer.

It is hard for me to determine distance; so I do not have a good idea of the viewing distance. Let me just say that the birds were up in the sky above me flying and I was able to view them close up. It has been many years since I used a quality pair of binoculars and it was a joy to see the details of the birds and animals with these binoculars. There was a raptor in a large tree and I was able to see the colors and the markings of the bird. When viewing the deer in a field I was able to see their faces clearly and watch them graze.

While walking the neck strap is comfortable around my neck and does not give me any irritation or neck pain.  The neck strap is easily fastened and removed in the field. The Bino Gloves are also easily attached and removed from the neck strap. It is a handy feature to be able to attach the Bino Gloves to the neck strap when using the binoculars without the neck strap in the field. The Bino Gloves have been protecting the lenses and do not fall off in the field, even when the binoculars are stored inside my pack. There are no seen scratches on the lenses or imperfections from use.

I had to opportunity to use them on a day that it was humid and I was pleased that the lenses did not fog or become moist.  In bright sunshine there is a tiny bit of glare, but not as strong as some of the lesser quality binoculars I have used in the past. Even when viewing in sunshine the colors are still true and crisp. The lenses were easily cleaned with the included lens cloth.

Update 1/10/12

The Brunton Eterna Binoculars have been used for the past month in wilderness areas while hiking/biking and along the coastal areas of Southern California. So far I am impressed with these binoculars; there is no distortion, the image is clear, the color is accurate, and there is minimal glare. I am also pleased that the lenses refrain from fogging up. The binoculars have a rugged type of design and they are not exactly light weight. However, I would compromise weight to have a great looking, true, and crisp image.

The images viewed through the binoculars have been mostly wildlife, primarily deer and birds. The images displayed are clear and the color is true. I can see markings on the wildlife and the details of land formations at the beach.  The quality of the images is excellent and I find it pleasant to view birds flying overhead and deer in fields with a closer view.

The Bino Gloves keep the lenses protected from scratches and dirt. So far the lenses have not scratched and are easily whipped clean. The Bino Gloves are still easily removed and easily stretched over the lenses. The Bino Gloves are snapped to the neck strap with a mild amount of force. The neck strap is comfortable, even with the weight of the binoculars.

The binoculars are still easy for me to adjust if I am wearing glasses. Sometimes it is difficult for me to recall which way the eye cups are adjusted for wearing glasses. I wish there was some kind of identifying marker on the eye cups to indicate which setting is for glasses.

I plan to continue using these binoculars especially in protected wildlife areas. Spring will be here soon and it will be great to view wildflowers through these binoculars.

For more information on the Brunton Eterna Binoculars please visit The binoculars retail for $324.00.

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