Question about Nikon Action 7204 Binocular

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Nikon action 10x50 shifted prism

Suffered a knock and now produce a double image. No external damage

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Dont no where your from but should be collimated by someone with experience in nikon, cost should be about $30.00 plus shipping total$40.00. if i can be of any more help contact me @ larry@reichinstruments.com

Posted on Dec 22, 2008

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Found a local repairer who can fix it.

Posted on Dec 20, 2008

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I have a Nikon Travelite IV binocular, 8x23 6.3" #400841. I am getting double images now, what can be done? A friend had the same problem, said you replaced them. Please help, thank you. Dave...


They are out of collimation, probably because one of the prisms has shifted due to a knock.

FixYa did not replace your friend's binoculars- this site just gives advice and has no connection with manufacturers or retailers. You should contact the manufacturer or perhaps the place you bought them.

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My nikon 10x50 action binoculars have developed the problem of the left and right lenses not viewing the same image. the left side view is much lower than the right. i don't know if the prism was knocked...


Common problem with binoculars after a knock. One of the prisms has shifted, putting them out of collimation (alignment). If they are very high quality or collectible they might be worth fixing. It is likely to be expensive. I have done a few pair myself, but only when it was uneconomic to have it done professionally (I have ruined a few too).

Nov 21, 2010 | Nikon Optics

1 Answer

Our grandson dropped our binoculars and now we have a double image.


This is a common problem with binoculars. One of the prisms has shifted and the two sides are therefore no longer in optical alignment (collimation). Unfortunately, fixing this requires a degree of expertise, which may cost more than you will want to spend. I have often taken old binoculars apart or found external adjustments that allowed me to realign them, but I have ruined a few pair this way. Not a good idea if they are valuable.

If you can find the paperwork and they are still in warranty, you might try to get Canon to repair them, but I suspect that they will say they have suffered an accident, not a manufacturing fault.

Nov 18, 2010 | Canon IS Binocular

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After several years use without accidents or damage, cannot focus to one image any longer and left eye will not focus to clear any longer. They are Barska, 8x42 reverse porro prism.


I fear these have suffered damage without your knowledge. The collimation has gone bad, hence the two images instead of one. As the left side doesn't focus properly, I would guess that one of the prisms in that side has shifted position, which would account for both defects. This can be fixed by a skilled and knowledgable person, or made worse by someone who does not know what they are doing, but in the end, it may be too expensive to have them put right by an expert, as very good binoculars are available quite cheaply today.

Nov 16, 2010 | Barska Optics Optics

1 Answer

Nikon Action 10x50 6.5degree-seeing double image,did not do this until recently. Can it be fixed?


The double image is caused by the most common killer-fault on almost all binoculars: the yoke assembly which the eyepieces is mounted on has either bent or broken.

The only fix is to replace the yoke assembly: unbending it is not accurate enough and usually breaks it, gluing is no good as the contact surfaces are far too small for the adhesive to carry the mechanical loads, and usually results in a yoke which still needs unbending...

It's not a cheap fix and is only worth doing on really expensive models: given that you can buy the same pair again for less than £60 in the USA and around £100 in the UK then it's a no-brainer as the new model will cost far less than the repairs.

Sorry to disappoint you, but some faults just cannot be economically repaired. I hope that my answer has still been of use to you and that you take a moment to rate my answer.

May 01, 2010 | Nikon Optics

1 Answer

No apparent exterior damage but now my nikon's have "double vision" clear on each individual tube but doubled vision when veiwing normal. any suggestions?


The prisms have shifted inside of the binoculars. This is not an easy job as you have to make corrections to the angle of the prisms for leaning field and collimation. Two suggestions:
1. If they are under warranty take them to a repair agent.
2. If you want to do it yourself, there are instructions on the web about how to go about effecting a collimation. Too long to go into detail here.

Dec 29, 2009 | Nikon Action Binocular

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My Nikon binoculars show two images


must have been dropped ...have to be realigned if you want i can supply estimate 15088331232 ...larry

Aug 08, 2009 | Nikon Optics

1 Answer

Need right eyecup replacement for Nikon Action 10x50


contact nikon and these parts should be ordable through their customer service.

Feb 03, 2009 | Nikon Team Realtree Binocular

1 Answer

I'm getting double vision in my Nikon 10X50 Lookout II binoculars. This is the second time in about 2 years. They have been excellent for many years ad I really don't want to buy any more at this time. ...


Hi cmbaldwin,
Double vision is caused by misaligned collimation,
Make sure all segments are screwed tightly together.
including the screw under the little cap on the center hinge.

If none of the above fixes it, you probably have a misaligned prism In the binoculars. That unfortunately is a factory fix.
I would call Nikon customer service on the phone,
Tell them you love their product, but are very, very, frustrated with the same problem repeating itself ( I hope you haven't dropped the binoculars)

If you get nowhere, ask to speak to the customer service manager, explain the problem all over again.
If that will not resolve it. Ask them them if they have a trade up program.
Never hurts to ask.

As you say, they are a outstanding company to work with.
and let them know that you won't settle for anything less than a Nikon. They do want you as a lifelong customer.

Don't get frustrated, just keep jumping through the hoops until you get the problem resolved to your satisfaction.
Good luck and best regards, Paul

Jun 12, 2008 | Nikon Cameras

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