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  • Nikon Action 7x50 EX Extreme ATB Binocular
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Nikon Action 7x50 EX Extreme ATB Binocular

by Nikon
| 4 answered questions

List Price: $236.95
Price: $139.95 & FREE Shipping. Details
You Save: $97.00 (41%)
Only 19 left in stock (more on the way).
Ships from and sold by Amazon.com. Gift-wrap available.
  • Waterproof, fogproof, and shockproof performance
  • All-metal chassis in lightweight polycarbonate shell
  • Rubber-coated body for firm, non-slip grip
  • Magnification: 7x
  • Objective lens: 50mm
9 new from $137.00 1 refurbished from $139.95

Need help deciding which binoculars or spotting scope to buy?

Check out our Binoculars & Optics Buying Guide to discover how binoculars and spotting scopes work and learn how to select the right equipment for your next outdoor adventure.

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Frequently Bought Together

Nikon Action 7x50 EX Extreme ATB Binocular + Nikon 7072 Lens Pen Cleaning System + Nikon 8072 Microfiber Cleaning Cloth
Price for all three: $159.19

These items are shipped from and sold by different sellers.

Buy the selected items together

Technical Details

  • Model: 7239
  • Objective Lens Diameter: 50.00 mm
  • Eye Relief: 17.1 mm
  • Weight: 1.231 Kilograms

Product Details

Product Warranty: For warranty information about this product, please click here [PDF]
  • Product Dimensions: 9.6 x 8.4 x 4.2 inches ; 2.2 pounds
  • Shipping Weight: 3 pounds (View shipping rates and policies)
  • Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • ASIN: B0001EFIGQ
  • Item model number: 7239
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (31 customer reviews)
  • Amazon Best Sellers Rank: #2,167 in Camera & Photo (See Top 100 in Camera & Photo)
  • Date first available at Amazon.com: July 7, 2004

Product Description

Product Description

7 x 50mm - Waterproof, Fogproof, Armored - Prism Binoculars

From the Manufacturer


The Monarch ATB 42mm with Dielectric High-Reflective Multilayer Prism Coating binocular features brighter, sharper colors, crisp and drastically improved low-light performance. A new body style provides unparalleled strength and ruggedness in a package that is comfortable to carry all day. With rugged rubber armor for added durability and a firm grip even in the worst conditions, Nikon guarantees every ATB to be 100% waterproof and fogproof, each is backed by Nikon's 25 Year Limited Warranty and No-Fault Repair/Replacement Policy. The new Monarch ATB 42mm with Dielectric High-Reflective Multilayer Prism Coating binocular is available in 8x42, 10x42 and 12x42. It is also available in Team REALTREE models with the REALTREE APG HD camouflage pattern.

Technical Specs

Magnification x
Objective Diameter 35
Angular FOV – Real 9.3
Angular FOV – Apparent 59.3
FOV @ 1000 yds 488
Close Focus Distance (ft.)
Exit Pupil (mm)
Relative Brightness 25
Eye Relief (mm)
Size (L&W) (in)
4.7 x 7.2
5.4 x 7.4
7 x 7.7
7 x 7.7
7 x 7.7 7 x 7.7
Weight (oz)


Additional Action EX Highlights:

http://g-ecx.images-amazon.com/images/G/01/electronics/binoculars/nikon/NikonNo-FaultBinoSm._.jpgWarranty Information

Nikon is dedicated to quality, performance and total customer satisfaction. If your Nikon binocular, Spotting Scope or Fieldscope requires service or repair not covered by our 25 Year Limited Warranty, Nikon will repair or replace it (even it was your fault) for just $10, plus return shipping and handling.
Excludes – StabilEyes, Laser Rangefinders and Spotting Scope/Fieldscope eyepieces.


Real field of view
Real field of view is the angle of the visible field, seen without moving the binoculars, measured from the central point of the objective lens. The larger the value is, the wider the viewfield available. For example, binoculars with a wider field of view are advantageous for locating fast-moving wild birds within the viewfield. This also applies for finding small nebulas or a cluster of stars in astronomical observations.


Apparent field of view

Apparent field of view is the angle of the magnified field when you look through binoculars.
The larger the apparent field of view is, the wider the field of view you can see even at high magnifications.

With the conventional method used previously, the apparent field of view was calculated by multiplying the real field of view by the binocular magnification. (With this formula, apparent field of view wider than 65˚ is called wide field of view.)

After revision, Nikon's figures are now based on the ISO 14132-1:2002 standard, and obtained by the following formula:

tan ω' = τ x tan ω
Apparent field of view: 2ω'
Real field of view: 2ω
Magnification: τ
(With this formula, apparent field of view wider than 60° is called wide field of view.)


For example, the apparent field of view of 8x binoculars with an 7.0°real field of view is as follows:
2ω' = 2 x tan-1 (r x tan ω)
= 2 x tan-1 (8 x tan 3.5)
= 52.1

Relative Brightness
Relative brightness value is obtained by squaring the diameter of the exit pupil. The greater the relative brightness is, the brighter the image will be. With 8x42 binoculars, the brightness is (42÷8)2= 28.1. This means that if the magnification is the same, the larger the effective diameter of the objective lens, the brighter the image will be.

Do binoculars with the same exit pupil offer the same brightness?

No. Brightness may vary even if the exit pupil is the same. This is because the amount of light reaching the viewer's eyes varies according to the number of lens elements and quality of lens/prism coatings. Superior optical design and highquality coating greatly contribute to the brightness of binoculars. Brightness values specified in product brochures, etc. are theoretical ones calculated in the design process. Please note these factors when comparing actual brightness values.

Prisms are what let you see a correctly oriented image when you look through a pair of binoculars. There are two types of prisms in common use, Porro prisms and roof prisms.

Roof prisms are essentially in line inside the optical tubes, and make for a more compact set of binoculars. Roof prism binoculars have straight tubes (the front/objective lens is in line with the rear/ocular lens), and are therefore more compact, an important consideration for the sportsman. They usually have two pivot points between the tubes, and are more difficult to adjust to the spacing of your eyes. Roof prisms can give an optical image equal to the best Porro prisms, but for technical reasons they usually do not. To be really good, roof prism binoculars have to be in the high price class. Do not attempt to economize on roof prism binoculars.

Porro prism binoculars can be identified by their offset tubes; the objective lens is not in line with the ocular lens. The front lenses are usually closer together than the rear lenses, but the reverse can also be true, particularly in compact models. The Porro prism design is usually optically superior to the roof prism design, especially in medium priced class binoculars. Porro prism binoculars have a single pivot between the two halves of the binocular, and are therefore easy to adjust for the distance between your eyes.

Like roof prisms, not all Porro prisms are created equal. BAK-4 prisms are the best; they are made of superior optical glass that produces clearer images. These are what you want in your binoculars. BK-7 prisms are also used, usually in lower priced binoculars. These are satisfactory, but they are inferior to the BAK-4 prisms. Some manufacturers will not tell you what kind of prisms they use, usually because they are of inferior quality. BAK-4 prisms show a truer round, which translates to better light transmission and edge-to-edge sharpness

Prism Coatings
Multilayer coating is also applied to prisms to raise transmittance. A roof prism system has one surface that does not feature total internal reflection, so vapor deposition with metals, etc. must be used to raise the reflectivity of this surface. Also, phase-correction coating on roof surface ensures high-contrast images.
*Binoculars' brightness and contrast are affected by not only prism coatings, but also the number of objective lens and eyepiece lens, and types of coatings.

http://g-ecx.images-amazon.com/images/G/01/electronics/binoculars/nikon/Coatings._V202987056_.jpgMetal-vaporized, high-reflectivity prism coating
Using vacuum-vaporization technology, metallic material such as aluminum or silver is applied to the reverse side of a prism surface that is not totally reflective. This raises the reflectivity of the prism mirror surface.

Dielectric high-reflective multilayer prism coating
This coating features reflectance that exceeds 99%. By utilizing light interference, this coating assures high reflectivity across the full visible range, and ensures high color reproducibility.
http://g-ecx.images-amazon.com/images/G/01/electronics/binoculars/nikon/ReflectiveCharacteristics._V202987021_.jpgReflectance characteristics of prism coatings on mirror surface
The horizontal axis indicates the wavelength of light. The vertical axis indicates the reflectance of light.
Binoculars' brightness is determined not only by the reflective mirror, but also by the total optical system such as the number of lenses and quality of coatings.
Phase-correction coatinghttp://g-ecx.images-amazon.com/images/G/01/electronics/binoculars/nikon/PhaseCorrection._V202987059_.jpg
A roof (Dach) surface can cause phase shift of light that affects image resolution. This phenomenon is caused by phase differences arising from total light reflection on a roof (Dach) surface and it can occur with even a perfectly processed prism. Phase-correction coating is applied to the surface to minimize loss of resolution, ensuring high-contrast images.

Twilight Factor
The factor that has the greatest impact on resolution or image detail, will be dependent upon the amount of light available during the time of observation. During daylight hours, when your eye pupil size will be only about 2 to 3mm, magnification will be the principal factor in image resolution. At night, with the eye pupil dilated to 6 to 8mm, aperture size is the controlling factor. In twilight conditions both of these factors control resolution effectiveness and the twilight factor is the term that compares binocular performance under these conditions.

The twilight factor is calculated by taking the square root of the product of the magnification and the aperture. The higher the twilight factor, the better the resolution of the binocular when observing under dim light conditions. For example, a 10 X 40 (twilight factor 20) would effectively resolve better under these conditions than a 7 X 35 (twilight factor 15.4) even though the 10 X 40 has a smaller exit pupil. Remember, however, that the twilight factor does not take into account the transmittance or quality of the optical system.

Customer Reviews

Save gobbs of money.
chester callaway
I have a lot of binoculars and these are among the finest.
Harry W. Clements Jr.
These are great for clarity and light gathering ability.
Chris Colebank

Most Helpful Customer Reviews

33 of 33 people found the following review helpful By Dude Of All Trades on February 19, 2011
This is the armored versions of the Nikon Action 7 X 50 binocular, so most of the comments you read about those will apply to these as well. I have owned these for several years now and I have enjoyed them immensely. The field of vision is good, but not fantastic. Clarity is unbelievable. But where they REALLY excel is in low light viewing (see chart above on main page). I can easily see things in the dark that my naked eye just can't grab, and I have excellent night vision. Amazing how much I miss without these.

Why I say be sure that you need them is that you pay a fifty dollar premium over the Action 7 X 50. This buys you rubberized armor for bumps, water-proofing and fog-proofing. This also means you won't get condensation inside when going from hot to cold or visa-versa. If you get in and out of your car or house a lot, use binoculars outdoors in the mist or rain, or take them through brush, it's worth the extra money. If you look at things through your window or only in good weather, save your money and get the Action 7 X 50 or some other good binoculars.

In choosing a Nikon binocular, refer to the chart above on the main page to see what suits your needs. I didn't like the 7 X 35's, but they get great reviews, (I'll review them on their own page), so make sure you try them out first if possible.
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20 of 20 people found the following review helpful By Harry W. Clements Jr. on July 26, 2011
I have a lot of binoculars and these are among the finest. Because they are 7X50, they MUST be large and heavy. If you are going to carry them around for extended distance and don't need the light passing attributes, go for some 7X35's, which will be a lot easier to carry. I have 7X35 (German lens) Leupold's which are the best binoculars I own and an 8X40 waterproof pair which are great. I also have 8X40 Bushnell Audubon non-waterproof 8X40's which are nice but can't be used in the rain. They all, with the exception of the Bushnell's, cost more than these NIKONS. I was employed in a line of work that often required binoculars and they issued us junk, so I am picky, now in the extreme. Cheap binoculars will give you actual headaches and be real hard on your eyes because they are not regulated (point to the same exact area). Do not buy junky binoculars for anyone, even children or you will be sorry and out money for nothing.

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9 of 9 people found the following review helpful By N. Roybal on February 10, 2012
Verified Purchase
On the recommendation of an experienced birder, I purchased a pair of Nikon 7x50 binoculars (model: 220637) when I was 18. I used them for my USFS biological tech field work during the 80s and for birding. The Nikon 7 x 50s large field of view and magnification make viewing wildlife a joy. Their strong light gathering capability is great for star gazing and seeing the moons of Jupiter too.
Fast forward thirty-three years. Last month, I purchased the Nikon Action 7x50 EX Extreme ATB Binoculars (model: 7239) and lovingly retired my old pair of Nikons. January birding on the Pacific Flyway and observing an active short-eared owl at dusk with my new binoculars were priceless.
The Nikon Action 7x50 EX Extreme ATB Binoculars are of exceptional quality at a great price. They make tracking moving birds easy. Observing bird plummage and bird behavior becomes intimate with the crisp clear maginification . Low-light performance is outstanding, and I like their waterproof, fogproof, shockproof performance.
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9 of 10 people found the following review helpful By Amazon Customer on April 20, 2011
Purchased these for my merchant marine husband. He wears glasses and uses them all the time at sea and on land. He has not found a better pair for the price! I would recommend this product to anyone needing binoculars!
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6 of 6 people found the following review helpful By J on December 8, 2011
Verified Purchase
These binoculars are freakin awesome!
If you are looking for high end binoculars these are them. I bought them and recieved right before a recent hunting trip here in South Texas and WOW! I just cant believe how clear and how much light is gathered by this product.
I was using the binoculars to scout for deer and hogs just around dusk and was loosing light quick and when four deer showed up I could easily identify the animals features. When I transitioned to the rifle (with a bushnell scope that I like alot) I could not see the deer as well and therefore passed on the shot. These binoculars outshined my scope by far and now I just purchased the Nikon Monarch 3-12 x 42 scope after being so impressed with these binoculars.
I have also used these binoculars to observe deer in the field behind my house at night, yes I said it - at night. There is a little residual light from some street lamps and the deer are not visible by the naked eye except maybe a little dark spot. I take out the binos and WOW there were four deer about three hundred yards away eating some brush that I could not even see with the naked eye.
These binos also have a feature I have never experienced with binoculars before - The eye relief is actually best at about 1/2 inch away from the face. That means if you are wearing shooting glasses or sunglasses you don't have to remove them to scan.

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