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8X 40mm Metal Military BAK4 Prism Binoculars

Digg(0) ( 8 Reviews)
US $216.99

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Qty 2-4 5-9 ≥10
Price USD$ 210.48 USD$ 208.31 Wholesale Price >>
Shipping cost: Free Shipping To Shipping cost:   USD$ 0.00 To United states Via Estimate shipping fee
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If you've always wanted a high performance 8X 40mm but weren't ready to spend the big dollars leave it up to BOSMA to deliver performance at a tremendous value. The Binoculars features fully multi-coated optics for excellent low light performance with a peak light transmission. Suffice to say, images are crisp, clear and bright - even in low light. Don't miss it!
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Product Description

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  • Specifications:

    • Large diameter, bright field of view, & clear vision
    • Like their roof prism relatives, the BAK4 prism provides great durability and performance in a "traditional" prism design
    • Compact to full-sized, the contemporary Military Binoculars is multi-coated optics
    • Multi-coated optics for superior light transmission and brightness
    • Long eye relief for full field of view with eyeglass or sunglasses
    • Made of metal, great choice for your outdoor use
    • Sharp multicoated optics for superb contrast and vivid color
    • Waterproof, antifog and shockproof are guaranteed to outperform any other binocular
    • Suitable for all kinds of harsh environment
    • Magnification: 8X
    • Objective Lens Diameter: 40mm
    • Focusing System: Middle transfer
    • Field of View(ft/1000yds): 435
    • Near Focus Distance: 4m
    • Exit Pupil Diameter: 5mm
    • Exit Pupil Distance: 19.2mm
    • Eye Cup Type: Rotation
    • Coating: Green-FMC
    • Waterproof: 1.5m
    • Tripod Mount: Yes
    • Material: BAK4(Prism); Metal(Body)


    BOSMA BOSMA 8X 40mm Metal Military BAK4 Prism Binoculars

    • Multi-coated optics for superior light transmission and brightness


    • Large diameter, bright field of view, & clear vision

    How to Collimate Binoculars:

    When the series of lenses and prisms in each of a binoculars' barrels align perfectly, they produce a merged image and are said to be "collimated." Rough handling during shipping or use can knock binoculars out of collimation. Miscollimated binoculars produce fuzzy or overlapping images and possibly oval, cat's eye-shaped exit pupils, the miniature images you see in each eyepiece. This can lead to eyestrain, headaches and a degraded user experience. To correct miscollimation, manufacturers build adjustable prism tilt setscrews into many of their models. If prism tilt is excessive, however, or lenses are misaligned lenses, have a professional collimate your binoculars.

    Checking Horizontal Collimation:

    • Go outdoors in daylight and focus your binoculars on any large object with distinct horizontal and vertical edges, at a distance of about 100 yards
    • Relax your eyes. Alternately open and close them, about every second. You should see the binoculars' image move slightly to the left when opening the left eye and to the right when opening the right eye. This slight movement is normal and desirable
    • Adjust the prism tilt screws to restore collimation if you detect more than a slight amount of horizontal movement

    Checking Vertical Collimation:

    • In the daytime and outdoors, look at a distinct horizontal line, such as a roof line, gutter or fence rail
    • Slowly move the binoculars about 4 inches away from your eyes as you keep looking at the images in the eyepieces
    • Check that the horizontal feature you focused on remains an unbroken straight line--in other words, no part of it is displaced vertically
    • Adjust the prism tilt screws if you detect any vertical displacement

    Adjusting the Prism Tilt Screws:

    • Locate the two prism tilt setscrews just ahead of the eyepiece on each barrel. For rubber-armored models, pry up the rubber covering with your screwdriver to expose them. Be careful not to overstretch the rubber; you want it to snap back to its original position when done
    • Remove the protective glue from the setscrew's top and insert the screwdriver in the slot
    • Turn the right barrel's setscrew clockwise in very small increments to move the image in the right eyepiece to the left and down, counterclockwise for up and right
    • Turn the left barrel's setscrew in the same manner, clockwise or counterclockwise, to adjust the image's horizontal and vertical alignment in the left eyepiece
    • Adjust one or both setscrews as necessary, frequently checking progress using the horizontal and vertical collimation tests, until the two images merge horizontally and there is no vertical displacement

    Tips & Warnings:

    • The ultimate collimation test is to view a bright object, such as Jupiter, in the night sky. It should be well merged, with no double images. Properly collimated binoculars will also have nice, round exit pupils. If the exit pupils are oval, even with the images perfectly merged, collimation is not complete and your binoculars will need professional attention. Always register your binoculars' warranty
    • Binoculars with porro prisms have the two setscrews. Binoculars with roof prisms may have two additional setscrews, for a total of four, that need to be adjusted in sync with each other
    • Do not attempt to remove binoculars' objective lenses or other interior lenses to fix collimation problems. Lenses need to be removed, properly aligned and reinstalled by skilled technicians using specialized equipment

    Package Included:

    • 1 x Binoculars
    • 1 x Bag
    • 1 x Rope
    • 1 x Manual
    • 1 x Desiccant
    • 1 x Lens Cloth

Customers' Reviews

  ( 8 Reviews)
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Bought this item on

00:00:00 09-15-2011 Reasonable price Overall:  
  • Other Thoughts: Nice for small glasses, my entire mother 75, can carry now on her bird walks, works fine. Great price.

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Bought this item on

00:00:00 09-14-2011 Slightly Heavy but compact Overall:  
  • Other Thoughts: It’s slightly heavy, but really compact. I bought these for bird watching.

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Bought this item on

00:00:00 09-14-2011 Lovely Overall:  
  • Other Thoughts: It folds nicely and fits into any pocket or since it's lightweight, you can easily put it in the pouch provided and wear it around your neck.

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Bought this item on

00:00:00 09-14-2011 High quality Overall:  
  • Other Thoughts: I actually bought these binoculars for a Justin Timberlake concert my son and I were going to. For the price, they really, really served its purpose.

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Bought this item on

00:00:00 09-13-2011 Great value Overall:  
  • Other Thoughts: I am using them in tandems for bird watching and they are great. I recommend them to anyone. Great Value!

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Bought this item on

00:00:00 09-13-2011 Compact Binocular Overall:  
  • Other Thoughts: I wasn't sure how good these binoculars would be given the size, but I had a lot of confidence in the 8 x 40mm Binoculars. I'm very happy I decided to take a chance and buy them. They are everything I was hoping for.

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Bought this item on

00:00:00 09-13-2011 Great Value Overall:  
  • Other Thoughts: These BAK4 prism binoculars easily fit in a pocket next to a cell phone, or with the included case strap to a belt. I used these for game viewing in Africa and was not disappointed; got me close to the action and were never a hassle to lug around or take out. For the money, these are a great value.

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Bought this item on

00:00:00 09-13-2011 Wonderful Overall:  
  • Other Thoughts: Amazing metal military BAK4 prism binoculars for the price.... very light, very small, perfect for any events, even indoors since they are the smallest binocs I have ever seen, and I have seen dozens.... well worth the money... easy to focus wheel. Highly recommended.

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