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Nikon 8239 10x42 Trailblazer ATB Binoculars

by Nikon
| 3 answered questions

List Price: $226.95
Price: $179.00 & FREE Shipping
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Only 1 left in stock.
Ships from and sold by 17th Street Photo.
  • 10 x 42mm
  • Waterproof & fogproof
  • Nitrogen filled & O-ring sealed
  • Rubber armored body
  • Turn-&-slide eyecups
3 new from $159.95 1 refurbished from $104.99
$179.00 & FREE Shipping Only 1 left in stock. Ships from and sold by 17th Street Photo.

Frequently Bought Together

Nikon 8239 10x42 Trailblazer ATB Binoculars + Allen Company 4 Way Adjustable Deluxe Binocular Strap, Black
Price for both: $189.15

These items are shipped from and sold by different sellers.

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Technical Details


Product Details

  • Product Dimensions: 6 x 3.5 x 8 inches ; 1.8 pounds
  • Shipping Weight: 23 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B0030BEQ4W
  • California residents: Click here for Proposition 65 warning.
  • Item model number: 8239
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (22 customer reviews)
  • Amazon Best Sellers Rank: #11,041 in Camera & Photo (See Top 100 in Camera & Photo)
  • Product Warranty: For warranty information about this product, please click here
  • Date first available at Amazon.com: October 2, 2001

Product Description

Product Description

NIKON 8239 Trailblazer 10 x 42mm All-Terrain Binoculars

From the Manufacturer


http://g-ecx.images-amazon.com/images/G/01/electronics/binoculars/nikon/atb_logo._V202516209_.jpg

Nikon Trailblazer All Terrain Binoculars (ATB) are full-size roof prism binoculars that are right at home or on any hunt. The Trailblazer features a slim, easy-to-carry design with a full-size view for the budget-conscious consumer.

Nikon Trailblazer ATB Binoculars offer generous eye relief and turn-and-slide rubber eyecups allowing the binoculars to be used as comfortably and effectively by eyeglass wearers as those with uncorrected vision. In addition, the Trailblazer binocular offers a sizeable field-of-view at 1000 yards.

Nikon Trailblazer ATB Binoculars incorporates Nikon’s exclusive Eco-Glass (made without the use of arsenic or lead) for lens and prism elements, as well as multicoated lenses for maximum light transmission and image quality. Ergonomic styling, mated with a rubber-armored exterior, the Nikon binocular provides added shock resistance and a firm grip, wet or dry.

Nikon Trailblazer ATB Binoculars are fully waterproof and fogproof and they are covered by the legendary Nikon ruggedness guarantee -25 Year Limited Warranty and No-Fault Repair/Replacement Policy.

Technical Specs
  • Focusing System – Center Focus
  • Magnification – 10x
  • Objective Diameter – 42mm
  • Angular FOV – Real – 5.6°
  • Angular FOV – Apparent – 52.1°
  • FOV @ 1000 yds – 293 ft
  • Close Focus Distance – 16.4 ft
  • Exit Pupil – 4.2mm
  • Relative Brightness – 17.6
  • Eye Relief – 15.4mm
  • Size (L&W) – 5.9 x 5.2
  • Weight – 22.4
  • Waterproof/Fogproof – Yes
Rugged Rubber Armor for Added Durability

Warranty 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.

FAQ's

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.

http://g-ecx.images-amazon.com/images/G/01/electronics/binoculars/nikon/RealField_of_View._V202987058_.jpg

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.)

http://g-ecx.images-amazon.com/images/G/01/electronics/binoculars/nikon/ApparentField_of_View._V202987062_.jpg

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.

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 Questions & Answers

Customer Reviews

These binoculars did not come with a case, cleaner or lens covers.
Carol
I bought these as a gift for my girlfriend who is a field biologist and she loves them.
Amazon Customer
The combination of field of view, magnification and clarity of optics was excellent.
nickindc

Most Helpful Customer Reviews

45 of 46 people found the following review helpful By Don Clark on November 19, 2011
Verified Purchase
I purchased these binoculars for use during a two-week African safari. Such an excursion is rare for me so I wanted to be equipped properly. My travel site recommended binoculars in the range of 7x35 to 10x50. My instinct, of course, was to go with 10x50. The bigger, the better! Right?

Though I have been a backyard birder for years, I always made do with my 10x50 Bushnell binoculars. I had no idea they were low-end binoculars until I began researching other models. While researching, I learned of several specifications used for binoculars and was able to identify the specifications most important to me: 1.) weight, 2.) magnification, 3.) diameter, 4.) focal distance, 5.) mirror type, 6.) weatherproof, and 7.) price.

I prepared an Excel spreadsheet listing a dozen models, one per row, and entered the above specs in columns. I even looked up the specs on my Bushnell model. From there it was easy to see how the binoculars compared. Once I established priorities for the specifications, such as weight, mirror type and price, the choices narrowed. Eventually I settled on the NIKON 8239 Trailblazer 10x42 ATB Binocular because of its surprising low weight, fine mirrors, weatherproofing and reasonable price.

Once in Africa the binoculars performed admirably. From the foggy mornings in the shadow of Kilimanjaro to the arid mid-day heat of the Serengeti, the Nikon binoculars delivered clear, crisp images of the flora and fauna we were there to see. The 42mm diameter made it easy to follow moving animals and the 10x brought them up close. The lenses inevitably became covered with dust but that was easily wiped away with a lint-free cloth.

If I had to buy binoculars again, I would buy this exact model. My wife feels the same about her identical binoculars.
Read more ›
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9 of 9 people found the following review helpful By nickindc on November 9, 2011
Verified Purchase
I purchased these for a trip to Kenya and Tanzania, as was very pleased with the results. The combination of field of view, magnification and clarity of optics was excellent. They are larger and heavier than the smallest binoculars available, but the difference in capability is well worth it.
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5 of 5 people found the following review helpful By bazant on August 8, 2012
Verified Purchase
these are great - as sharp as you would expect from Nikon optics.
Bright, small - good value for sure.
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4 of 4 people found the following review helpful By Carol on October 25, 2013
Verified Purchase
These binoculars did not come with a case, cleaner or lens covers. It did not advertise that it did but wouldn't you assume it had a least a case and lens covers? I certainly did. Fooled me. Buyer beware. For a very few dollars more you can buy them from Nikon brand new with everything.
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5 of 6 people found the following review helpful By Jere H. Williams, Jr. on March 3, 2012
Verified Purchase
If you want a pair of lightweight binoculars with excellent clarity and typical nixon build, I can not recommend these highly enough. Great quality and such good value.
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1 of 1 people found the following review helpful By davmar on April 7, 2013
Verified Purchase
A bit heavier than I expected, but clarity is superb. I would recommend this product to a friend. Birding is great with these bins.
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I bought these binoculars about three years ago and figured I would write a review. They are pretty awesome. I have a home office where I have a large hill/mountain view out of my window where the furthest distance I can look at is about 650 yards away. The hills obviously change color through the seasons and at some times they are very green and other times very monochromatic brown. These binoculars have great contrast and great low light ability for their size and cost. I use them to watch coyotes, hawks, etc. and the coyotes blend in almostt perfectly with the browns on the hill...but these binoculars help me pick them out no problem. Now keep in mind, I do not use these in the field, so I cannot tell you if they are tough or not...mine sit on my desk shelf until I pick them up. They really don't get banged up at all. They are so good optically though, that I wish Nikon made a Trailblazer that was much larger in magnification and field of view. I would totally buy them.
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2 of 3 people found the following review helpful By Peter Anthony on October 3, 2013
Verified Purchase
Clarity and brightness great. W
When rubber eye rings are screwed out for use without eye glasses there is a black ring that appears at bottom of view unless positioned perfectly to avoid this - a little aggravating.
Would like a hand strap on side to eliminate neck strap.
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Most Recent Customer Reviews