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25X 40X 102mm Dual Drum Binocular

Digg(0) ( 8 Reviews)
US $1271.69

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Qty 2-4 5-9 ≥10
Price USD$ 1233.54 USD$ 1220.82 Wholesale Price >>
United states Via Estimate shipping fee
· Orders over USD$ 50.00 will get free tracking services via air mail
These binoculars feature maximum transmission values and minimum stray light levels so that they have amazing twilight performance. This binocular with full size views is easy to carry. Multiple layers of anti-reflective compounds deliver bright, high-resolution images.
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Product Description

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  • Specifications:

    • Multiple layers of anti-reflective compounds deliver bright, high-resolution images
    • Aspherical lenses eliminate virtually all distortion
    • Quick, smooth central focusing
    • Standard lineup of sleekly designed binoculars features highly advanced optical technology and intelligent design
    • Using professional water-proof anti-fog mirror the entire design, can prevent the water vapor entering the prism to avoid mildew, resulting in longer life, stronger ability to adapt to the environment
    • Magnification: 25X, 40X 
    • Objective Lens: 102mm
    • Prism: Bak4
    • Ocular/Field Lens: FMC All Broadband Green Film
    • Focus Mode: Transfer to other localities
    • Focusing System:  Individual
    • Minimum Focus Distance: 6m
    • Size: 450 x 255 x 160mm/17.7 x 10.04 x 6.3in(L x W x H)
    • Material: Bak-4 prisms(Prism Glass)


    • Exit Pupil: 18mm
    • Eye Relief: 25mm
    • Eield Angle: 4.2°
    • Field of View(at 1000yds): 44ft/1000yds
    • Field of View(at 1000m): 25m/1000m


    • Exit Pupil: 17.5mm
    • Eye Relief: 22mm
    • Eield Angle: 2.6°
    • Field of View(at 1000yds): 26ft/1000yds
    • Field of View(at 1000m): 15m/1000m


    Asika  Asika 25X 40X 102mm Dual Drum Binocular

    • Aspherical lenses eliminate virtually all distortion

    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 Asika 25X 40X 102mm Dual Drum Binocular

Customers' Reviews

  ( 8 Reviews)
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Bought this item on

00:00:00 09-14-2011 High quality Overall:  
  • Other Thoughts: The binocular is really great as others had reviewed. Lots clearer and easier to focus than the rugged exposure one. The built quality is also solid. My son also gave it 5 stars!

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Bought this item on

00:00:00 09-14-2011 Great buy Overall:  
  • Other Thoughts: I got these along with a bird identifier book to start watching birds around where I live. For the money, they're a great buy.

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Bought this item on

00:00:00 09-14-2011 Not the greatest Overall:  
  • Other Thoughts: I would say these are a good secondary pair of binoculars to leave in your car or ones to bring when you don't want to worry about ruining them.

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Bought this item on

00:00:00 09-14-2011 Like it Overall:  
  • Other Thoughts: Just got it this afternoon. Nice size and decent quality. I'm ready for my whale watching trip.

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Bought this item on

00:00:00 09-13-2011 Good view Overall:  
  • Other Thoughts: This102mm dual drum binocular was even smaller than I thought they would be, which is nice. The case takes up very little room. Good clear view, easy to focus, I think they're great for the price.

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Bought this item on

00:00:00 09-13-2011 Awesome for the money Overall:  
  • Other Thoughts: I purchased two, one for my husband and another for me for use at concerts. Asika 25X 40X 102mm dual drum binocular has combined compactness and great optics at an unbelievable price!

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Bought this item on

00:00:00 09-13-2011 Perfect Overall:  
  • Other Thoughts: I purchased this binocular for my husband. He loves them!. They are small enough that they're able to fit in his pocket, yet strong enough to see pretty far into the distance, with good detail. Great product, great value!

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Bought this item on

00:00:00 09-13-2011 Great Overall:  
  • Other Thoughts: I like the quality of the binocular, and the compact size makes them easy to carry.

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