Question about Fujinon CD Binocular
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.
Posted on Jul 28, 2008
' 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.
Posted on Jul 28, 2008
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Posted on Jan 02, 2017
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