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My focus knob on 10 x 42 e2 binoculars has been loose now it came off

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Posted on Jan 02, 2017

o0zappa0o
  • 7 Answers

SOURCE: The adjustment knob was very hard to turn. Any way to lubricate?

I would be inclined to use a penatrative aerosol lubricant (like WD-40) in very sparse quantities. Squirt a little in using the WD40 smart straw applicator to direct the lube accurately and work the adjuster back and forth in a small section. Repeat this until you have freed up the adjustment from one end of its scope to the other. The focal adjustment is typically housed separately to the lenses and careful application of the lube should not affect them - avoid overusing the lube and have a mopup cloth under the spray zone to keep overspray/drips to an absolute minimum.

Posted on Aug 18, 2009

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1 Answer

Why does the right tube on my binoculars not respond to the focus/adjustment knob?


I would not suggest any kind of repair or adjustment yourself - take to a reputable repair facility, and get an estimate, which could be quite high, as it is precision work.

Sep 29, 2016 | Optics

1 Answer

How do I fix the focusing knob not working on minolta compact II binoculars 10x25L?


When you say not working, is it not achieving accurate focus when turned, or just not rotating at all ?

Aug 29, 2016 | Minolta Optics

1 Answer

The eye piece is completely disconnected. Can not focus.


check that the center adjustment for focus is still in the thread of the adjuster knob
it can screw too far out and will not screw back in until you gently press the eye section back in as you turn the knob

Jan 26, 2016 | Optics

1 Answer

Focus knob turns but nothing moves


The Celestron manual for this scope has nothing to say, but on the underside of the focuser assembly, between the 2 focus knobs, you may see 2 screws.
They might be thumbscrews or some other screwhead type. One is the adjustment for the focuser internal clearance, or looseness, and the other is a focus travel lock.
If present, try backing both off 1/2 turn from tightness, and then experiment to see which is which. The focus lock will have no effect until tight, when the focuser will cease moving, as is now. The other screw will gradually remove looseness and rattle from the focuser until it just moves smoothly, with no back and forth loose feeling at the knob.
If neither of these screws is visible you will have to take it to a binocular and telescope shop, where they should not charge much.

May 02, 2012 | Celestron Optics

1 Answer

I own the Bushnell binoculars 21-1242 waterproof. The focus knob is broken. Can it be fixed? Can not focus them.


easy they are under warranty for 30 years from date of purchase send therm back to bushnell...

Aug 23, 2010 | Bushnell H2O 13-2412 (12x42) Binocular

1 Answer

There is some sand or dirt under the focus knob that makes a noise when the knob is turned. How do you take the knob off to clean . Thanks


There is a central aluminium decal on the focus knob. CAREFULLY prise it off using the tip of a sharp knife trying not to distort it (it's hard to panel beat a small bit aluminium!). Once off you should see a central screw or two screws that hold the focus wheel in place. Remove the screw(s) and the focus wheel noting the orientation of the focus wheel to the body. Use a dot of Liquid Paper to show registration. You can then clean around the focuser and the inside of the focus wheel before reassembly.

Jan 03, 2010 | Swift 10x42 HCF Viceroy Waterproof...

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 side won't focas


You don't say what model binoculars you have, but there are two possibilities (well, three, but the third one is that your binocs are broken - lets try the other two first!)

Some very fine binoculars have individual focusing for each eyepiece. You focus each side for your eyesight. If that's the case with your binoculars, there won't be a central focusing control.

If you DO have a central focus knob, it's possible that your binoculars have a "diopter" focus on one or the other eyepiece. Look at the rim of the eyepiece for a marking that looks like "+ . . . | . . . -" or something similar. What you want to do is focus the binocs using the central control so the the UNMARKED eyepiece is in focus for you (close one eye to focus), then switch eyes and focus the marked eyepiece by rotating the eyepiece rim until both eyes have good focus.

Binocular manufacturers do this because many people have better vision in one eye than the other, and many people also prefer to use binoculars without their glasses. Hope this helps.

Oct 07, 2009 | Barska Optics Optics

1 Answer

Focus knob problem


have repaired a few of these ...some whells have tiny set screws to tighten, some are a two piece wheel that loosens up sometimes, if not that then it is broken. if i can be of further help...15088331232

Apr 26, 2009 | Optics

1 Answer

Out of focus


Assuming you are focussing correctly. When binoculars are out of collimation the most usual effect is double vision as the optical axis do not line up. The only thing you can do is to take them to a binocular repairer. The problem is the cost. Proper repair need the use of a device known as a collimator and it is a laborious task to do it properly. Your binoculars do not carry a high monetary value and a proper repair will cost more than a new binocular of similar specs. Porro prism binoculars mostly have the objective lenses set further apart than the eyepieces. This holds true except for reverse porro prisms which are the other way round. Roof prisms have both the front and rear lenses inline.
Make sure when you focus that the first eye you use to focus with is the one where the eyepiece does not have its own focus ring (dioptre). The dioptre adjustment is on either the left or the right depending on the brand. That eyepiece should be left alone until you have focused using the center ring. Then leave the center ring alone and focus the eyepiece that has the adjustment ring.

Mar 12, 2009 | Optics

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