Binocular Pupil Distance

binocular pupil distance
Binoculars Double Image?

So I finally got my 10×50 Nikon binoculars yesterday, they were working great.

When I looked through them the image I was seeing was one single image but today when I look through them I’m getting double image, like single image for each eyepiece.

is this an alignment problem? When I decrease the inter pupil distance the image starts to look like one single image but when I increase the distance between the eyepieces the image looks double.

Is this a collimation problem?

Yes, they are out of collimation. This is unacceptable for brand new binoculars. I would return them for a replacement.

[Edit] It’s worth mentioning that some people are incapable of merging the images in binoculars. I have an astronomer friend who is like that. Once you find the correct interpupillary distance, you should leave it there…moving from the optimum distance will cause eyestrain, and may be what’s causing your double images. Incidenatlly, the view through binoculars NEVER looks like what you see in movies or TV: ∞ ; it’s always circular.


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