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Orion 20x80 Astronomy Binoculars

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Big 20-power astronomy binoculars with huge 80mm aperture objective lenses provides bright, high-contrast views of the night sky with sharp resolution
Giant 80mm lenses gobble up light for spectacular views of the Moon, planets, star clusters, and more!
Fully multi-coated optics and BAK 4 porro prisms ensure maximum light throughput for bright, clear views
Long 17mm eye relief for comfortable views - even while wearing eyeglasses!
Includes built-in tripod adapter, soft carry case, and dust caps. Tripod use recommended

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Item # 51464

Mfg Model # 51464

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Providing pinnacle-performance views at a bargain-basement price, our new Orion 20x80 Astro-Binoculars pack a visual punch usually reserved for astronomy binoculars with a much larger price tag. With top-quality features such as high-transmission BAK 4 prisms, fully multi-coated optics, and gigantic 80mm (3.14") aperture objective lenses, the affordably-priced Orion 20x80 Astro-Binoculars will astound you and your friends with its amazing viewing capability.

The giant 80mm objective lenses gobble up light from objects in the night sky, yielding bright views with exceptional contrast and sharpness. These big and powerful binoculars gather over 30% more light than 70mm aperture models for brighter views of cosmic curiosities. An integrated heavy-duty tripod adapter lets you easily attach the binocular to any field tripod or binocular mount, which is recommended for extended use. So go ahead, grab more light from the night sky with a pair of Orion 20x80 Astro-Binoculars tonight!

Warranty

Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-676-1343.

Warning

Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

Product Support

Visit our product support section for instruction manuals and more

Specs

Best for viewing

Brighter deep sky
Magnification

Magnification

A measure of the enlargement of an object seen through an optical instrument. More specifically, it is a measure of the angle subtended by an image viewed with optical aid divided by the angle subtended by the same object without optical aid. Magnification is determined by dividing the focal length of the telescope (or binocular) by that of the eyepiece. Hence a telescope with a 1200mm focal length and an eyepiece of 40mm yields a magnification of 30x. The human eye is considered 1x magnification.

20x
Optical diameter

Optical diameter

The optical diameter (also known as aperture), is the size of the telescope's main light collecting lens or mirror, measured in millimeters or inches. As the diameter increases, more light is collected and the resolution increases.

80mm
Field of view - angular

Field of view - angular

The field of view expressed as part of a 360-degree circle. Holding your pinky finger out at arms length is approximately 1-deg wide. To convert this to the linear measurement of "feet at a thousand yards", multiply by 52.5. For example, at 1000 yards distance, a 7-deg binocular will see a width of 367.5 feet (7 x 52.5)

3.2°
Field of view - linear

168.0 ft./1000 yd
Apparent field of view

Apparent field of view

The edge-to-edge angular diameter of the light emerging from the eyepiece as seen by the eye. It is an inherent specification for a given eyepiece type or design. The apparent field of view of an eyepiece is directly related to the true field of view seen through the telescope; for a given focal length eyepiece, the greater the eyepiece's apparent field of view, the greater area of sky will be seen.

64.0°
Eye relief

Eye relief

The distance, measured in millimeters, between the observer's eye and the eyepiece lens in which the entire field of view remains visible. Eye relief varies with the optical design but generally increases with decreasing magnification. Long eye relief is advantageous for observers who wear glasses, as they don't have to put their eye directly on the eyepiece to see the entire field of view, nor do they have to remove their eyewear.

17.0mm
Exit pupil

Exit pupil

The diameter of the circle of light exiting the telescope eyepiece. It appears as a distinct disk when the telescope is pointed at a bright source like the Moon. Also known as the Ramsden disk, the exit pupil varies with both aperture and magnification.

4.0mm
Near focus

Near focus

The minimal distance at which a binocular and/or spotting scopes can attain focus. Near focus is an important quality for bird watchers and wildlife devotees who want to get as close as possible to their quarry.

60 ft.
Coatings

Coatings

Lenses are coated with an antireflective material to ensure that as little light as possible is reflected away, so more gets to your eye. Good lenses are at least "fully coated," with a single layer of magnesium fluoride applied to each air-to-glass lens surface. Multiple layers of coatings are even more effective; the term "multi-coated" means one or more lens surfaces have multiple coatings. "Fully multi-coated" is even better, meaning that all lens surfaces are multiple-layer coated. Mirror star diagonals are coated with a reflective material similar to telescope mirrors in order to reflect the light into the eyepiece. Standard aluminum coatings reflect between 88%-92%, and enhanced aluminum reflects 97%. Dielectric coatings use a different process to deposit a coating that reflects 99% of the light. In addition to the higher reflectivity, Dielectric coatings are much more durable than aluminum coatings, so they last longer and can be cleaned with less risk of damage.

Fully multi-coated
Prism

Prism

Porro Prisms: A binocular prism system that contains two right-angle prisms in each barrel offset from one another, requiring that the objective lenses be spaced further apart than the eyepieces. Optically, porro prisms often perform better than their roof prism counterparts. Roof Prisms: A compact binocular prism system that allows the objective lenses to line up directly with the eyepieces and hence yields a more portable binocular. Roof prism binoculars lose slightly more light to reflections than porro prism binoculars. High-quality roof prism binoculars compensate for this with special optical coatings.

BAK-4 Porro
Interpupillary distance range

Interpupillary distance range

The distance between the two pupils of an observer's eyes. Binoculars can be adjusted to accommodate variations in a person's interpupilary distance.

56mm - 72mm
Focus style

Center focus
Tripod adaptable

Yes
Diopter adjustment

Yes
Weight

4.7 lbs.
Warranty

One year

Shipping Info

Orders received by noon Pacific Time for in-stock items ship the same business day. Orders received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

Reviews

Orion 20x80 Astronomy Binoculars

Rating??

4.5 / 5

Open Ratings Snapshot

Rating Breakdown 4 Reviews

5 stars

3

4 stars

0

3 stars

1

2 stars

0

1 star

0

Optical Quality??

4 / 5

4 / 5

Mechanical Quality??

4.5 / 5

4.5 / 5

Ease of Use??

4.8 / 5

4.8 / 5

Value??

4.5 / 5

4.5 / 5

3 out of 4(75%)reviewers recommend this product.

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4

4 Amazingly affordable 20-power astronomy binocular with giant 80mm lenses provides bright views of the cosmos with exceptional contrast and sharpness. Features built-in tripod adapter, fully multi-coated optics, BAK 4 prisms and 17mm of eye relief.

Rating??

4.5 / 5

Open Ratings Snapshot

Rating Breakdown 4 Reviews

5 stars

3

4 stars

0

3 stars

1

2 stars

0

1 star

0

Optical Quality??

4 / 5

4 / 5

Mechanical Quality??

4.5 / 5

4.5 / 5

Ease of Use??

4.8 / 5

4.8 / 5

Value??

4.5 / 5

4.5 / 5

3 out of 4(75%)reviewers recommend this product.

Read all 4 reviews

Share this product

Product reviews

Click on filters to refine your results.

Ratings summary

Rating??

4.5 / 5

Open Ratings Snapshot

Rating Breakdown 4 Reviews

5 stars

3

4 stars

0

3 stars

1

2 stars

0

1 star

0

Optical Quality??

4 / 5

4 / 5

Mechanical Quality??

4.5 / 5

4.5 / 5

Ease of Use??

4.8 / 5

4.8 / 5

Value??

4.5 / 5

4.5 / 5

3 out of 4(75%)reviewers recommend this product.

Read all 4 reviews

Share this product

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Product ReviewsWrite A Review

Rating??

3 / 5

Poor color correction

PostedFebruary 11, 2012

Top 50 contributor
This reviewer is considered a top contributor due to the number and helpfulness (as voted on by readers like you) of the reviews they have submitted.
Top 50 contributor

from??Henderson, NV

Owned this product for:Less than 3 mos

Optical Quality??

2 / 5

2 / 5

Mechanical Quality??

4 / 5

4 / 5

Ease of Use??

5 / 5

5 / 5

Value??

3 / 5

3 / 5

With the binoculars I received, the chromatic aberration (color fringes) of the optics were very pronounced. Looking at the Moon (or anything bright) I saw an electric yellow band of color around the edge. It was especially bad looking at Jupiter. I thought I was seeing double. Looking through a Short-Tube 80 at the same magnification--no discernible fringe.

Favorite viewing location:??Front porch

Favorite object to observe:??Moon

Pros: good price

Cons: chromatic aberration too distracting

No, I do not recommend this product.

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Rating??

5 / 5

Great for viewing DSO's and nature.

PostedDecember 28, 2011

Top 250 contributor
This reviewer is considered a top contributor due to the number and helpfulness (as voted on by readers like you) of the reviews they have submitted.
Top 250 contributor

from??Jackson, Wyoming

Optical Quality??

5 / 5

5 / 5

Mechanical Quality??

4 / 5

4 / 5

Ease of Use??

4 / 5

4 / 5

Value??

5 / 5

5 / 5

I bought these binoculars to use when I want to view the night sky when I go backpacking and when I just want some quick views of DSO's at home. Fortunately, I live in a town with very, very little light pollution, and when I need to, a national park with even more clear skies is just 15 minutes away. With these 20x80 binocs in my clear skies, I have managed to hunt down nearly 80 of the Messier objects. The Andromeda Galaxy and its companions fit completely inside the field of view-- a dark lane was visible with averted vision, I even made out the a subtle amount of spiral structure in M51. The moons of Jupiter are easily visible as well as the rings of Saturn and its moon Titan. If the skies are clear and steady enough, Rhea and sometimes even Tethys can be spotted. Besides astronomy, these binoculars are great for views of the outdoors. I use them for getting better, closer views of birds and big game animals, I also enjoy exploring the face of mountain ranges with these from a distance. However, in order to get the best experience from the binoculars, a tripod is HIGHLY recommended. Without a tripod, your hands will get shaky and tired from holding them.

Favorite viewing location:??Home

Favorite object to observe:??M 51 and M 3

Yes, I recommend this product!

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Rating??

5 / 5

Orion 20 X 80 is a excellent choice !

PostedSeptember 21, 2011

from??Ca.

Owned this product for:Less than 3 mos

Optical Quality??

4 / 5

4 / 5

Mechanical Quality??

5 / 5

5 / 5

Ease of Use??

5 / 5

5 / 5

Value??

5 / 5

5 / 5

The Orion 20 X 80 is a excellent choice for the beginner and the armature. Its has a little star flare around the edges but overall viewing is outstanding and well worth the price. ( You will need a Bino mount tho ) Enjoy !! I am ...

Favorite viewing location:??Moon, Planets, star clusters .... The universe !

Favorite object to observe:??Our Moon and Jupiter and its moons

Yes, I recommend this product!

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3of 3voted this as helpful.

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Rating??

5 / 5

AMAZING

PostedSeptember 18, 2011

from??Pensacola, FL

Optical Quality??

5 / 5

5 / 5

Mechanical Quality??

5 / 5

5 / 5

Ease of Use??

5 / 5

5 / 5

Value??

5 / 5

5 / 5

My grandmother just ordered these received them last week. I got a chance to look through them yesterday. After using these I know I'm gonna have to order a pair for myself !! The case that comes with the Orion 20x80's is top of the line. Everything about them is nice including the tripod adapter. It was super easy to set up . In the late afternoon we were trying to focus them on some far away tree tops in the west and I saw a light in the sky. I focused the bino's and couldn't believe I was looking at Saturn! It was still day light ! You could see the rings. It was beautiful. If you can't afford a telescope get these 20x80 bino's and a decent tripod . Binoculars are a great way to start Astronomy. Great for scanning the sky and easy to set up and take with you everywhere. I can't wait to get a chance to use these again. ENJOY !!!

Favorite viewing location:??Dark wide open spaces when possible but mostly end up in the back yard.

Favorite object to observe:??Orion Nebula, Pleiades , Jupiter , Saturn, All star clusters

Yes, I recommend this product!

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Since 1975 Orion Telescopes & Binoculars has been offering telescopes for sale direct to customers, with an unswerving commitment to best quality products, value and unmatched customer care. Our 100% satisfaction guarantee says it all.

Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you. And you'll enjoy discount prices by buying your telescope online, direct from Orion. Not sure how to choose a telescope? Orion's Telescope Buyer's Guide is a great place to start.

Orion binoculars are known for quality optics at a great price. We offer binoculars for every viewing interest, including astronomical binoculars, compact binoculars, waterproof binoculars, birding binoculars, sport and hunting binoculars, and even night vision binoculars.

Orion's telescope and astrophotography accessories will enhance your telescope enjoyment without breaking the bank. Expand your viewing experience with accessories ranging from moon filters to power-boosting Barlow lenses to advanced computerized telescope mounts. Capture breathtaking photos with our affordable astrophotography cameras. And when you're stargazing, Orion's telescope cases and covers, observing gear, red LED flashlights, astronomy books and star charts will make your observing sessions more convenient, comfortable and meaningful.

At Orion, we are committed to sharing our knowledge and passion for astronomy and astrophotography with the amateur astronomy community. Visit the Orion Resource Center for in-depth information on telescopes, binoculars, and astrophotography. You can find astrophotography "how to" tips and share your best astronomy pictures here. Submit astronomy articles, events, and reviews, and even become a featured Orion customer!