Help! Can't seem to correct double vision in new binoculars!

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  • Member since
    May, 2005
Help! Can't seem to correct double vision in new binoculars!
Posted by Anonymous on Wednesday, August 08, 2007 6:37 PM

I put a similar post at the end of a different thread, but I thought I'd start a separate one.

I just received a set of Celestron Skymaster 15x70's via UPS from

To test them out, I tried looking down my street with them.  I'm getting tons of double vision.  Adjusting the distance between each half doesn't seem to help, unless I bring them as close together as they allow.  At this point, however, it seems like I'm only seeing out of one eye.  

Have my new binoculars been knocked out of alignment? 

I don't own a scope, so I was counting on having these this weekend for a star party /open house with the local astro club.  


Sad [:(]


  • Member since
    March, 2007
Posted by jkade on Wednesday, August 08, 2007 7:11 PM

I have the same binoculars.  I have experienced a similar problem a few times on astronomical objects.  Check to make sure the right eyepiece focus is adjusted for your eye, and adjust the angle of the center bracket so you have a coherent, solid view.

I don't remember what I did to get the double vision to go away, to be honest.  It may have something to do with one half being hotter than the other?

Somebody will definitely be able to help you out at Stargate, though. 

Detroit, MI, USA:
Equipment: Orion XT-8 Classic, Orion StarBlast 4.5" EQ, 10" square wooden handbuilt Dob, Celestron 15x70 binos, eyes
  • Member since
    July, 2002
  • From: Texas
Posted by chipdatajeffB on Wednesday, August 08, 2007 10:28 PM

There's not much you can do about it before the weekend, so take them with you to the star party. Chances are very good that someone else there will have the same or similar binoculars and you can compare. Chances are even better that someone there who is more experienced with binoculars can check them out for you.

Someone who is more experienced can also give you observing tips (if you need them).

Worst case: you'll have to send them back to Amazon after the weekend and exchange for another pair. Best case: You'll find someone at the star party who can show you what's wrong and it's something minor (like user adjustment). In the meantime, use them for the weekend even if you have to close one eye at times.

The swing adjustment that moves the two eyepieces closer or farther apart is called the interpupillary adjustment. That should be adjusted so that the centers of the eyepieces are the same distance apart as your eyes. If you wear eyeglasses (not mass-market sunglasses or reading glasses) you can start by matching the distance between the eyepieces to the distance between the centers of the lenses of your eyeglasses. Then look through the binoculars at the stars and fine-tune that distance if needed.

The right eyepiece adjusts it focus independently of the left. First aim at the stars and move the center focus adjustment (moves both eyepieces at once) until the view through your left eye is focused. Then close your left eye and focus the right eyepiece with the ring around it. Then fine tune the center focus adjustment for best focus.

If you still have double vision, try tilting the binoculars left/right very slightly. You may find you need to tilt them to a certain position to minimize the double vision thing.

If between fine-tuning the interpupillary adjustment and fine-focusing and tilting the binoculars right or left you still can't eliminate the double vision, then something is wrong.

I mentioned in another post recently that the Starmasters I have a nice, but they come with a useless case and are not packed well for shipment. That causes many of them to be knocked out of alignment during transport. I bought a plastic foam-lined pistol case at a sporting goods store to better protect mine after I sent them back for alignment.

The universe is not only stranger than we imagine, it's stranger than we CAN imagine. --- JBS Haldane

Come visit me at Comanche Springs Astronomy Campus (we're on Google Maps) in Texas.

  • Member since
    July, 2001
  • From: PA, USA, Earth Moderator
Posted by DaveMitsky on Wednesday, August 08, 2007 11:08 PM

It sounds like your binoculars are out of collimation.

Dave Mitsky 


Sic itur ad astra!

Chance favors the prepared mind.

A man is a small thing, and the night is very large and full of wonders.

  • Member since
    May, 2005
Posted by Anonymous on Thursday, August 09, 2007 3:30 AM

If you can possibly return your badly aligned (miscollimated), that would be recommended.  You can read good information about the problem by searching on the phrase "collimating binoculars".  There's a good article and also at least one good thread on the website.  You might be able to do it yourself; those articles will help you know.  Getting them fixed professionally (except under warranty) would probably cost more than you paid in the first place.  By checking with a local astronomy club, you might find that someone in your area who knows how to do it.  Best of luck --

Ed Cannon - Austin, Texas, USA


  • Member since
    March, 2007
Posted by jkade on Thursday, August 09, 2007 6:06 AM
Also note that Celestron has a no-fault lifetime warranty on those binos.  I haven't had cause to use it, though, so I don't know if there are service charges etc. associated with them.
Detroit, MI, USA:
Equipment: Orion XT-8 Classic, Orion StarBlast 4.5" EQ, 10" square wooden handbuilt Dob, Celestron 15x70 binos, eyes
  • Member since
    June, 2007
Posted by Hastur on Friday, August 10, 2007 5:07 AM

Hi, jjmcwill, maybe this note can help you.


  • Member since
    May, 2005
Posted by Anonymous on Friday, August 10, 2007 5:33 AM
 jjmcwill wrote:


I just received a set of Celestron Skymaster 15x70's via UPS from  




Send them back to Amazon. Check your invoice and there are intructions for return. You will have to print out a return label. Amazon pays the return freight and the freight for a replacement. It should cost you nothing other than time. If you were to send them to Celestron i believe the warranty fee is $25.00 plus shipping. Not a smart route to go. Amazon will eventually get you a good pair, but it may take a few trys. Once you get a good pair you will be jubilant about the views. Good luck and clear skies,



  • Member since
    November, 2006
Posted by Genesis 1:1 on Friday, August 10, 2007 7:00 PM

I agree with starramus, send it back!

There is absolutely no reason that you should ever have to try repairing or collimating a brand new binocular.Thumbs Down [tdn]

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