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That means that the central axis is loose or out of alignment. Or a prism inside, or doubtfully one of the lenses, has come loose from its mounts or is otherwise out of alignment.
I don't think that there's anything you can do. The binoculars will most likely have to be taken to a shop or repair facility, or sent to Nikon perhaps.
Two questions first though:
- How old are the binoculars in question? measured from their date of purchase.
- and, Have they been dropped or otherwise subjected to any great mechanical shock in their lifetime?
Warranty, that's what I'm trying to determine, by asking:
How old are the binoculars in question? measured from their date of purchase.
There will be no warranty, if the binocs are that old.
Have they ever been dropped or had a mechanical shock in their lifetime?
Then they will need servicing, but it won't be free under warranty.
You can send the binoculars to Nikon Repair.
The cost will be quotable by Nikon. It will be out-of-warranty repair for sure, I think.
To contact Nikon Repair, and see if you can get a quote on repair *before* committing to repairing with them, go to
To find a local Nikon Authorized repair station in your area (and a phone # for them, with which you can ask for a quote on the repair), use this facility:
but since their categories don't list binoculars on this page, you may have to get some help using this locator facility, from me... if so, let me know your local zip code, town/city and state, and the model # if any of your Action binocs.
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