Question about Fujinon CD Binocular

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Focusing problems I can not get rid of the double image at long distance

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Hello Samaro,

This effect is produced when the tho sides of the binoculars are not focusing the same.
Since you sayit is present at long distance, it might be that one barrel is stuck and is not focusing the same as the otherone when you scroll the middle "focuser".

What you can do is open it up and try to clean it, also see if there is something, that is making one of the lenses not move forward as far as the other one.

Good luck,
Dahaka

Posted on Jul 28, 2008

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' If the barrels are not set parallel to each other, the binoculars will produce a double image.'


Focus the binoculars on a point source of light and then move it towards the edge of the field of view. The point should remain in sharp focus until somewhere around two-thirds of the way out towards the edge. Binoculars with a so-called flat field should give sharp focus regardless of the position of the point within the field. Now focus the binoculars while centred on a straight line, such as the edge of a building. Inevitably, the line will appear to be bent at the edge of the field of view. Reject the binoculars if the line becomes bent more than a third of the way in from the edge. If the barrels are not set parallel to each other, the binoculars will produce a double image. Look through the binoculars while opening and closing your eyes. Look carefully for a momentary double image - it will become single as your eyes adjust to compensate - and reject binoculars that display this fault.

Source:
http://www.hinduonnet.com/fline/fl2412/stories/20070629000808500.htm

Posted on Jul 28, 2008

  • Ekse Jul 28, 2008

    Basically, try adjusting your binoculars. individual eyepieces and everything that is adjustable.

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I have an OPTOMA H27 projector, I am experiencing problems with the quality of the video images displayed. I set the focus by using the internal menu as an image reference. However when I view DVD/Video...


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if u are using the composite video the try component video. composite video will dive u a dull image than component one. also check the distance between the projector an screen.Make sure the projection screen is between the required distance 4.9 to 40.7 feet (1.5 to 12.5 meters) from the projector.
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Very blury above 10 x no mater how i ajust it and hard to veiw target nikon 8426 6- 24x50 bdc brand new


If you are trying to focus at a relatively close distance, you may be overpowering the scopes ability to focus at that distance. Most rifle scopes are set to parralax free at 100 yards.You can see this effect by putting the scope on its lowest power, focusing at 25-50 yards, and then increasing the power setting. You will see the image go out of focus as the power increases. This simply means that you must shoot at longer distances in order to use the scope to its full potential.

The other problem may be your parallax adjustment, but you may have already tried that solution.If not, make sure that the adjustment dial is set at the distance you are trying to shoot (minor adjustment from the indicated setting may be required to fine tune the image).

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2 Answers

Seeing double when I look with both eyes. Out of


Step 1.
Adjust the eyepiece or both if both are adjustable back to zero. It should be printed on there. If it's not, then halfway. To find halfway turn them to one end, count the number of turns like 1 and a half turns for example, and then half that atnd turn it that ammount. You've now reset the binoculars to zero.

Step 2.
Now to focus. Pick your target that you want to look at thoguh your binoculars. Look through the binoculars and close the eye with the adjustable eyepiece or your right eye if both are eadjustable and focus the image on the left eye with the central focus knob. Once you've got it focused close the left eye, open the right eye and if it's not in focus adjust the EYEPIECE focus, not the central one, until it's in focus.
If you can't get it in focus because the eyepiece focus won't turn far enough in one direction, turn the OTHER eyepiece in the opposite direction at max, start the process again from step 2.

If it's all ok now you need to adjust the distance between the eyepieces. Open the binoculars as far as they go, look through the binoculars with both eyes on the target and move the binoculars inward slowly until you remove any black edges around the image, then move them very slowly inward until you see only one image.

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Your binoculars are out of collimation. That means that the optical path needs to be aligned. Binoculars are designed so that the focus point of each barrel is the same over long and as short as possible distances. Binoculars that are properly aligned will still show a double image if you attempt to focus at something close that is too close for the models design. However this is not the same for long distances. The image at a long distance must not be doubled.

If they are under warranty and you haven't damaged them by dropping etc send them for repair to the manufacturer or ask the retailer where to send them.

If you are going to pay to have them fixed get a quote first. Binoculars that are of the zoom variety are not well thought of among binocular officionados as the quality of image degrades at higher magnification. For the price of repair you may be able to source a higher quality non zoom binocular.

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