Question about Meade ETX-125EC (500 x 127mm) Telescope

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Focusing problem I can turn manually focusing knob either direction and it will not focus, do you have any info how to resolve this problem. I can not find any drawings for this scope on internet.

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Re: focusing problem

It could be the grub screw on the knob needs tightening. If it is loose, the knob will just turn but the shaft wont.

Posted on Mar 15, 2008

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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 Telescopes

1 Answer

How to operate

This is a reflector style scope with a large mirror in the bottom, and a small secondary mirror underneath the focuser. The focuser is on the UP end of the tube as the picture shows in your question.

Simply insert the eye[pieces into the hole on the focuser and turn the knob left or right until the image comes to focus. Practice during the day time on a distant object starting with the eyepiece with the largest number written on it.

Read this-- about the types of telescopes.

Objects in the night sky are tiny and many of them are very dim-- the scope must be pointed directly at them or you will not see anything.

Find a local Astronomy club and the members will help you. All of Bushnell's manuals are located on this web site:

Jul 26, 2011 | Bushnell Deep Space 78-9003 (525 x 76mm)...

1 Answer

How u assemble the lens

The diagonal goes into the back of the telescope and then the eyepieces go into the diagonal. You turn the knob on the focuser slowly to focus.

Practice focusing during the day time on a distant object like building or telesphone pole using ONLY the eyepiece with the largest number written on it.

Jul 10, 2011 | Galileo 700 x 60 Refractor Telescope

1 Answer

I have a galileo FS 135DS 1100 X 135mm and am having difficulty getting it into focus. I have no user manual. What can I do besides addjusting the appiture?

You focus by turning the focus knob -- on the side of the focuser. Practice during the day time on a distant object.

Mar 20, 2011 | Telescopes

1 Answer

I cant get an image or focus

Put the eyepiece with the largest number written on it into the focuser. DO NOT USE the 2 x barlow if you have one. Go outside during the day time and practice focusing on a distant object, by turning the knob on the focuser in both directions until you see a sharp image.

Sep 29, 2010 | Bushnell NorthStar 78-8830 (525 x 76mm)...

1 Answer

Focus knob on Celestron NexStar 5 does not appear to be working. Knob still moves but does not sharpen the focus.

Does the focuser move in and out when you turn the knob? If it does then go outside during the day timne and practice focusing on a distant object. Use the eyepiece with the biggest number written on it.

This will give you the lowest magnification-- which is easier to focus.

Aug 02, 2009 | Celestron NexStar 114GT (269 x 114mm)...

4 Answers

Can't focus my telescope

If there is nothing on the objective lenses or eyepiece lenses then it most likely needs collimation. This is where you adjust the secondary mirror while viewing an out of focus star. You need stable sky conditions to do this.

There are most likely three small screws at the front of the telescope and these are what you use to adjust it. As one screw is loosened then another is tightened. Do this in very small increments. If you have your manual it should outline how to perform this. If not go to this web site: It will show examples of how objects look both in and out of collimation. There is a section further down the page for SCTs.

A very handy tool for this is to replace your screws with Bob's Knobs ( . These replace the screws and allow you to adjust it by hand instead of a screwdriver.

The other focusing problem I've experience with my Celestron SCT is to have the focus knob loosen up and then slip as I turned it so that I could never focus with it.

Good luck and clear skies!


Mar 29, 2009 | Meade Telescopes

1 Answer

Can't get to focus.

I think that the focus shaft has become un-attached by turning too far. Try placing the telescope facing directly upwards and start turning the focus knob clockwise. A little vibration on the tube will help the mirror to settle downwards. This may get the threaded rod back into the knob.

Jun 15, 2008 | Meade ETX-125EC (500 x 127mm) Telescope

1 Answer

Inoperative focus control

I'm assuming this is the Maksukov-Cassegrain telescope. Turning the focus knob CW should get you focus at infinity by moving the primary mirror away from the eyepiece. As you turn the knob it should move in and out relative to the real of the scope. If that's not happening the focus screw may have been turned CW too far and no longer be catching the threads in the rear plate of the scope.

You may be able to get it to rethread by holding the front of the scope toward the ceiling and turning the knob CCW. Attached is a photo of what the scope looks like under the rear housing. To prevent the focuer shaft from turning in too far the knob should be firmly seated agains the rear of the shaft. I think on this model this is a friction fit.

HTH, George

Jan 23, 2008 | Telescopes

1 Answer

Focus Issues

Try tightening the grub screw that fastens the knob onto the shft that it turns.

Better still, buy a flexible extended focusser which makes focussing much easier. Check on eBay for "Meade flexible focus"

Sep 27, 2007 | Meade Telescope

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