Question about Bushnell Powerview - Compact 10 x 25 binocular with a 10X magnification.

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Double vision I have a pair of bushnell 10x50 binocs i get double vision when using them.

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The distance between the centers of the eyepieces of your binocular must be the same as the distance between your pupils. This distance is adjusted as follows: 1. Focus on a distant object. 2. Pivot the two halves of your binocular farther or closer apart until you can see a single unobstructed, circular field of view. Make sure to focus on a distant object when you do this because when you focus on a close object you always see two slightly overlapping circular fields. Your binocular may have a scale on the top, between the eyepieces, to help you remember this setting.

Posted on Aug 04, 2007

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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

I have a Bushnell Instavision 10x50 WA. I have a double vision. How do I solve it. Please help


for this you will need to send the unit into their repair at 8500 marshall drive lenexa ks 66214 4-6 week turnaround and put your name address and telephone number inside the package. if there is a cost they will send an estimate.

Mar 23, 2010 | Bushnell 26-0400 Binocular

1 Answer

We gave our son a pair of Bushnell Binoculars, and we are having difficulty getting a good image. We have carefully followed the instructions with no luck. The problem is that we are getting a double...


The binoculars need collimation. The two sides are supposed to be parallel, if they are not you see two heads on horses, two footballs, two baseball bats etc. Check the binoculars for any external signs of damage. Are the front housings sitting properly in the body, is one of them not straight? If there is no obvious signs then you will need to take them to someone who can rebuild them for you. Usually the place where you bought them should be able to help you with a repair centre.

Dec 30, 2009 | Bushnell Falcon 13-3450 (10x50) Binocular

1 Answer

I have a cracked lens on a pair of binolulars.


Hi,

Back to Bushnell with them for repair.. It's too easy to mess things up in Bushnells.. Are they still within warranty??

Oct 10, 2009 | Bushnell Falcon Binoculars 10x50

2 Answers

I have double vision with binoculars. When I look at jupiter for example, I see 2 as if the optics are not aligned.


Your question is listed under "Zhumell Oberwerk 45 25x100 Astronomy binoculars". If these are what you have then they're an extremely high end expensive specialist item and will need professional realignment. I'm assuming that if you do own a pair of these then you're knowledgeable enough to have done all you can to adjust them correctly.

I suspect that you have a regular pair of 10x50 or similar binoculars, with a centre focus wheel and hinges. If this is the case then try to wiggle one of the eyepieces back and forth: if you can easily move it and the other eyepiece remains steady then you have a broken hinge. This is a very common fault especially if your binos have been dropped or if they've been stored in their case upside down (i.e.standing on the eyepieces).

A broken hinge is normally a write-off as there is rarely sufficient area to us epoxy glue on and the metal used is not usually suited to being brazed. Even when the hinge can be repaired it's normally permanently misaligned.

Either resign yourself to using one half of your binoculars or buy a new pair. In the UK LIDL regularly sell a pair of Meade 10x50 binos of excellent quality for just over £10 and that's only a little more than a bottle of epoxy resin glue costs. You may be interested to know that one of the world's most successful supernova spotters does so in his back garden in the UK using just half a pair of old 7x50 binos.




Sep 16, 2009 | Zhumell Oberwerk 45 25x100mm Astronomy...

1 Answer

Is my bushnell insta vision 7x35 or 10x50- how do I tell ?


The first number is the magnification the second number is the size in millimeters of the objective (large lens) So if you measure the diameter of the front large lens that will give you the size. So a 10x50 means a magnifyng power of 10 and an objective of 50mm.
Now to find out the magnification if you don't know what it is. Measure the front lens. Then if you look through the eyepiece lens while holding it away from you you will see that there is in each a small circle of light. That it what is known as the exit pupil. It lines up with the pupil of your eyes when you have the binoculars pressed up against your eyes. Now measure the diameter of the exit pupil in millimeters. It will only be a small number.

To work out the magnification use this formula. Magnification = Objective size divided by the exit pupil.
So a 10x50 will look like this M = 50 divided by 5....therefore M =10 which is the magnification.

Both the 7x35 and 10x50 will have an exit pupil of 5mm. So if yours is one of these then all you need is the objective (large) lens size.

Aug 04, 2009 | Bushnell InstaVision Binocular Binocular

1 Answer

Loose hinge _ Bushnell small binocs - 8 x 21; 392 FT at 1000 Yds.


Bushnells are inexpensive binoculars. A repair would cost more than a new one. If they are out of alignment to have them collimated would take time and that translates to expense. Its not something that can be done at home without a collimator. New ones similar to yours can be found online for between twenty to forty US dollars. Binoculars today can be bought much cheaper than a few years ago. If you are happy with the use you have had from your Bushnells an update won't break the bank.

Jul 18, 2009 | Optics

1 Answer

Hi the ir is not working on my bushnell 26-0400,is there any way you can help (repair ?)


I had the same model, same problem. Bushnell replaced mine under warranty, If they needed to send it for repair it had to go to Russia. I guess it was cheaper to give me a new one. If its not under warranty Bushnell will send it off for you but it will cost quite a bit. My new pair lasted about 2 years with a lot of usage. Gen 1 night vision tubes do not have a very long life span. You may be better served buying a new pair of night vision binos.

Jul 08, 2009 | Bushnell 26-0400 Binocular

1 Answer

Double Vision Pentax 10x50 PCF III


If you have double vision it is out of collimation (alignment of the optical axis). You need to send this to the manufacturer for repair.

Jul 05, 2009 | Pentax PCFIII (10x50) Binocular

1 Answer

Repair of Celestron binos found in river


thought i answered this before but at my age who knows....the problem is water contains minerals that will eventyaully corrode the optics or at least the coatings.anyway if you want i can give you an esimate to repair....larry@reichinstruments.com

Nov 25, 2008 | Celestron Optics

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