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

1 Answer

Can't get to focus.

My telescope was boxed for 10 months. Now I turn the knob and even without the grub it still will not focus. I turned the knob for about 10 minutes and it nothing.

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  • jd482 Jun 20, 2008

    Thank you so much. The problem was fixed after doing what you said.

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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.

Posted on Jun 20, 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 Optics

1 Answer

I can't get my Meade 10" Lightbridge telescope to focus in the eyepiece. I bought a Meade Laser Collimator and Collimated it last night outside before I tried to observe Jupiter and it still didn't...


Even if the scope is a little out of collimation it should still focus. Put the eyepiece with the largest number written on it into the focuser. DO NOT use a 2x barlow if you have one.

Try again--- you can do this during the day time on a distant object and practice turning the focus knob slowly left and or right until you get a sharp image.

The higher the magnification the smaller the "sweet spot" with the focuser.

Jan 13, 2011 | Meade LightBridge 10 in. Standard (600 x...

1 Answer

HI, Just purchased a nextstar 8 and when I tried to view thru the main eye-piece, nothing. Even tried to look at the full moon, nothing again. Yes, all the lens caps are off but it seems like the focas...


Check the focus knob and make sure the small "set-screw" is tight and the knob is just not spinning around on the shaft.

DID you turn the knob enough to focus? Sometimes it may take 10 - 20 full turns.

Finally the focuser is attached to a "rod" inside the tube that moves the mirror back and forth to focus the scope. It could have come loose from the rod?

Instructions for disassembly are here:
http://www.celestron.com/c3/support3/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=2220

and here:

http://www.sciencecenter.net/hutech/misc/focuslk/index.htm this just shows how it works.

Oct 24, 2010 | Celestron NexStar 8i (600 x 203mm)...

1 Answer

I culmated my telescope and cant' get it to focus in. Using the focuser the image stays one big blob without any distinguishing figures.


Did you put an EYEPIECE into the focuser? Probably NOT.

Take the scope out in the day time, put the eyepiece with the largest number written on it into the focuser. Practice focusing on a distant object. TURN the focuser knob slowly until the object comes into sharp focus.

Sep 15, 2010 | Orion SkyQuest XT6 Classic Dobsonian (354...

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: http://www.astrosurf.com/legault/collim.html. 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 (http://www.bobsknobs.com/) . 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!

-jodair

Mar 29, 2009 | Meade Optics

1 Answer

I Cant see ANYTHING.


Put the lowest magnification eyepiece in the telescope-- it's the one that has the LARGEST number written on it.

During the daytime, go outside and point the telescope toward a distant object at least 100 yards away and practice focusing the telescope--- turn the focus know very slowly. Do this until you learn how to get a clear view of the distant object.

Once you have it focused wait until dark --- don't turn the focus knob. Your first sky object should be the moon or Venus -- which is the BRIGHT "star" in the west after dark....

Dec 29, 2008 | Vivitar (1607225) Telescope

1 Answer

Focusing Issue


The screws should be short enough not to stop the primary's travel, but pull them out and try it again. Good luck! George.

Jun 25, 2008 | Celestron NexStar 11 GPS (660 x 279mm)...

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
7793c63.jpg

Jan 23, 2008 | Optics

1 Answer

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.

Dec 22, 2007 | Meade ETX-125EC (500 x 127mm) Telescope

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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