Question about Pentax PCFIII (10x50) Binocular

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Double Vision Pentax 10x50 PCF III - Pentax PCFIII (10x50) Binocular

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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.

Posted on Jul 31, 2009

  • Kruze Kinder Aug 21, 2014

    It is possible to fix these at home. 1.) Remove large lens 2.) remove little screw on the side of the big lens. 3.) Take off cover.4.) Remove plastic piece. 5.) On the side that does not adjust screw tiny screw in that is by the pivot point of the binoculars. 6) put back the way you took apart.

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Posted on Jan 02, 2017

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I got a bino set Pentax 10X50 PCF WPII the right eyepiece came off. Can you fix? Thanks John


Fixya is not a repair facility. Contact your local optical repair workshop, or Pentax direct.

Nov 15, 2016 | Pentax Optics

1 Answer

10year old pentax 8x24 PCF G very stiff focus


you cold try lubing it with the drip down method, squirt penetrating oil in the focus rack and hold so it flows into rack. They used a thick grease for damping, you may try heating it in an oven up to 130F for 5 minutes (or leave in a hot car) to soften grease and then actuating the focus to get the hardened grease back into the helix.

Dec 07, 2012 | Pentax Optics

1 Answer

I seem to have a slight double image. when I unscrew one side of the lens a bit it lines back up, but leaves the lens loose. What could be wrong and can it be fixed? thanks,Brent.


You have the classic signs of the most common binocular fault: a bent or broken eyepiece carrier yoke.

The cause is usually due to the binos being dropped or the eyepieces getting knocked. The only cure is a replacement yoke, but the repair is rarely cost-effective unless the binos are really expensive and top-quality models. When last available new, yours sold for just over US$100 and repairs will typically far exceed that price.

Broken/bent yokes cannot be repaired: If bent, then it's near-impossible to unbend them accurately enough and in any case the process will always either break the yoke or will severely weaken it. Broken yokes cannot be glued together as the contact point is just too tiny for the loads it carries, and as it usually bends before breaking you'd simply end up with a bent yoke afterwards even if you could glue them.

Sep 10, 2010 | Pentax PCF V 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

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

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

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

1 Answer

Double vision


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.

Jul 03, 2007 | Bushnell Powerview - Compact 10 x 25...

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