Question about Swift Ultra-Lite 762 Binocular

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I fell and now the two eye pieces are out of alignment.

It is like seeing double. What should I do? Is this easy to fix? Or should I consider buying a new pair? I really love these and hate to loose them.

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This a problem with the prisms in the main body of the binoculars. It would seem that one or more have moved (there are four). Realigning is a difficult job but not impossible. Depending on the design, it should be possible to gain access to two of them, and hopefully you will see which one has moved. When aligned at factory, the prisms are usually held in place with a flat or “leaf” spring, and spots of paint/glue. This may give you a clue when you examine the prisms, and compare both sides.
To gain access to the bottom two prisms, try unscrewing the objective lens tube (the conical bit) from the main body, You may also need to remove one or two tiny screws that hold the protector plate in place. Do both sides at the same time so you can compare. With any luck, you might be able to re-seat the jarred prism to its original place. The top two prisms are harder to get to requiring the dissasembly of the focus mechanism, but if you go carefuly, you may get lucky, after all you have nothing to loose. Remember that binocular alignment does not need to be perfect, if it’s pretty close, the brain will compensate for any minor inaccuracies.
Please contact for further information
Kind Regards….Dave

Posted on Jan 03, 2009

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Collimation errors, as Dave talks about, can be repaired by a service workshop with a collimator if you can not get it right yourself. This is not something I'd normally recommend someone trying for themselves.

Posted on Mar 25, 2009

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1 Answer

How do I collimate my binoculars please because they have double vision.


It'll depend a bit on the root of the problem.
You can get double vision from properly aligned binoculars if the optics are too far apart or too close, relative to the spacing of your eyes. you'll need to bend them at the central hinge to make sure that both eyes are centered on the input lenses.

If you're still getting the migraine-inducing double image, they probably got dropped at some point. This can be a wide range of difficulty to fix. Here's what I've done in some past cases with flea market binocs that I bought cheap due to the skewed alignment.

For many binocs, the upper (eyeball end) and/or lower (field end) are screwed to the central body of the binocs, where all the folding optics are to widen the lenses from your eye spacing. If they have been dropped, (or disassembled and put back together sloppy), then they may be cockeyed at one of these joins. Look at each seam to the central body and see if any of them have a gap, especially one that is larger on one side than another. You can then apply firm un-screwing twist and see if it will unscrew. if it will, and before you unscrew it all the way, wash your hands and clear a clean surface to work on. Unscrew the segment, inspect the threads for crud that might have got in while cockeyed. Then visually square up the component and gently screw it back in. if it was mis-assembled, the threads may be a bit gummed, and you'll have to be patient to keep the optic square, and back off and start again if it tries to drag over to cockeyed threading. Once it's square, gently working the thread back into place by turning back and forth a half turn back, 3/4 forward, half back, 3/4 forward, can help the thread recuperate. Eventually, it should screw all the way in, firmly, and be square. No more double vision.

For some models, like my Nikon fixed pocket binocs, there's no zoom and just a focus knob. On my brothers pair, it got cockeyed. In that case, I gently unscrewed the locking rings for the glass on the eyeball side. One of them was loose and the lens was a bit cockeyed. In that case, I removed, it (wearing nitrile gloves), cleaned it with eyeglasses cleaning solution and a microfiber cloth, put it back in, screwed the ring in firmly,and it was good to go.

Bottom line, if you have some basic DIY skills, unscrewing the entry optics, or the optics sections, isn't too big a deal. Just be mindful not to let dust (or worse) get inside while you have things open. You can get a lot of fix just from that much.

Good Luck!

Mar 11, 2015 | Fujinon Mariner WPC-XL Binocular

1 Answer

One image is slightly above the other at all distances. After using the binoculars for even a couple of moments, my eyes are strained. The problem was present when the binoculars were purchased, however...


The oculars are not aligned properly causing double vision. Check on the binoculars to see if there is a place to adjust the alignment of either of the oculars. Look for any loose screws that may cause the two oculars to be out of alignment.
If this is not the case try adding some torque to the binoculars to see if the will adjust to where they will both point in the same direction. The eyes can fuse disparate images slightly but there is a very small range that they can handle. If the two images are separated by more than this small amount it will cause eye strain and double vision.

Feb 13, 2011 | Minolta 10x25 Activa D WP XL Pocket...

1 Answer

I have a pair of Plastimo military binoculars which have been fine up to now, but suddenly, despite being able to focus using the two eye piece controls, I cannot get anything other than a double image, no...


Hello - I never had Plastimo before but I have had a similar problem with double vision on a very similar looking pair of binoculars.
The eye piece movement just re-aligns eye focus differences , a double image usually means one of the lenses has moved inside the main tube. (usually from a knock/fall etc)
Can you rotate either one of the tubes ? On my pair I had to rotate anti-clockwide and found a prism inside that had slipped after a fall -
Close one eye and try to gauge which side is the best side -- Ray

Feb 05, 2011 | Plastimo Optics

1 Answer

I dropped my Nikon Action Lookout III binoculars, ...


The same happened to my Mizar 10X25 I tried things like moving the front lenses but then I discovered that most probably the binoculars fell on one of the four corners, this caused the tubes' direction to be twisted. It could be that the left is pointing slightly down or the right is pointing slightly up, which is essentially the same, and which is what happened to mine. You can discover this miss-alignment by watching using both eyes and then close and open one of them the phantom image will appear and disappear. What you have to do is apply a force with your hands twisting the binoculars one tube up and the other down and hold where you can see clear, I just discovered this and it works, I think I should be able to re-align them again, but I haven't faund how to do so. If you find a different solution please let me know here: gregsoli@yahoo.com

May 15, 2010 | Optics

1 Answer

The diopter setting eyepiece has come out of the body of my Bushnell 10X42 ''Waterproof'' binoculars, model 13-2410. I see keyways inside, but cannot screw it back in more than about 1/4 turn, which is...


The entire diopter setting eyepiece was off.I separated the eye cup from the rest of the diopter setting eyepiece, and aligned the channel guides on the lens piece to slide it into place. Then holding it in place, taking care not to gum up the lens, I experimented with how to screw in the retainer ring so that its white dot registered correctly. Finally reattach the eye cup and focus. It's like new!

Apr 10, 2010 | Bushnell Waterproof Binoculars

2 Answers

Seeing double when I look with both eyes. Out of


Step 1.
Adjust the eyepiece or both if both are adjustable back to zero. It should be printed on there. If it's not, then halfway. To find halfway turn them to one end, count the number of turns like 1 and a half turns for example, and then half that atnd turn it that ammount. You've now reset the binoculars to zero.

Step 2.
Now to focus. Pick your target that you want to look at thoguh your binoculars. Look through the binoculars and close the eye with the adjustable eyepiece or your right eye if both are eadjustable and focus the image on the left eye with the central focus knob. Once you've got it focused close the left eye, open the right eye and if it's not in focus adjust the EYEPIECE focus, not the central one, until it's in focus.
If you can't get it in focus because the eyepiece focus won't turn far enough in one direction, turn the OTHER eyepiece in the opposite direction at max, start the process again from step 2.

If it's all ok now you need to adjust the distance between the eyepieces. Open the binoculars as far as they go, look through the binoculars with both eyes on the target and move the binoculars inward slowly until you remove any black edges around the image, then move them very slowly inward until you see only one image.

If you've got more problems come back as ask. :-)

Nov 27, 2009 | Vector Audubon 8x42 Binoculars

1 Answer

One of the eyes got broken when it fell out of the tree stand


chances are when they dropped other optics moved as well, that means they will have to be realingned. i dont know what they cost you but i think its a done deal. sorry for that ,but there is so much cheap junk on the market today that it makes sense to just buy a new one as a good optics teh would cost at least $80.00 per hour to repair....larry@reichinstruments.com

Dec 08, 2008 | Vivitar 7x42 Hawkeye Rubber Armored...

1 Answer

Double Vision


Check this response and see if it might apply to you too:

 

http://www.fixya.com/support/t101778-binocular_double_vision

 

Good luck.

Sep 30, 2007 | Zhumell SuperGiant Astronomical Binocular

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