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Double vision, can not focus - Optics

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You haven't stated a make and model nor provided any other details, but you have asked about what is one of the most common binocular problems. I hope that you don't mind if I paste my generic answer below as there's no point in reinventing the wheel. If the answer does not provide a solution then please state your exact make and model and add any extra details which may help.

Your binoculars either have a bent or broken yoke assembly (the bit which carries the eyepieces) or one or more prisms have came unseated.

The first repair involves replacing the entire yoke assembly: the part is expensive in comparison to the retail cost of a new pair of binoculars and with labour charges on top is not usually a cost-effective repair except on really high end expensive models.

The second repair is straightforward and fairly quick for anyone with the right collimation equipment, but the screw(s) need to be secured with thread-locking liquid afterwards.

I hope you manage to use this information to fix your binoculars or at least that it assists you to choose your next course of action. Please take a moment to rate the free answer I have provided for you and any testimonial which you might wish to add is always welcome!

Posted on Oct 08, 2010

  • atrs Sep 20, 2011

    We all know that a screw is loose!
    Our question is ' What is the best way to get at the screw and collimating the crystel'?

  • Obertelli
    Obertelli Sep 20, 2011

    How long is a piece of string? If you won't share make and model details then I can't provide specific help. What's all this "we" business, anyway?

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