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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  • txlukas May 05, 2008

    I have the same problem. The knob turns freely but there is no change in the focus of the scope. The knob feels as though it is firmly attached to the shaft.

  • LMCYOUNG2001 Apr 06, 2009

    My ETX-125 EC would not focus, so I took the electronic focuser off and discovered that the focus knob was ok but the shaft was all the way into the housing. I gently pulled back as I turned the knob counter-clockwise was was able to begin focusing as the shaft pulled out. My theory is that if you keep focusing in to far, it causes the focus wheel to travel in to the safety point were it won't engage any further as a protection for the focuser and the scope.



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  • 4 Answers

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

How can I focus it other than using the focus knob

The focus knob is the way you focus overhead projectors. Perhaps you simply haven't turned the knob far enough? How far is the projector from the screen? If it's quite close, you need to turn the knob to raise the lens. If far away, turn it to lower the lens.

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Canon 450D viewfinder out of focus due to loose element within viewfinder, is this repairable

There's a diopter adjustment knob above and right of the viewfinder. Turn the knob while peering through the viewfinder until it comes into focus.

Jul 29, 2012 | Canon EOS 450D Digital Camera

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

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 to focus my document camera

  1. Power-Cycle your AVerVision Document Camera to reset the focus motor.
  2. If your Camera has Auto focus, Press the auto focus button on your document camera's control panel.
  3. Reset your camera to Default by Pressing MENU > Default > Yes > Enter. Then Power-Cycle your camera.
  4. Check your output device's focus adjustment.
  5. Power-Cycle your AVerVision Document Camera to reset the focus motor.
  6. If Manual Focus adjustment is available on your camera's remote control, try adjusting back to focal point from the remote.
  7. If your camera has a Manual focus knob, manually adjust the focus by turning the focus knob located on the camera head.
  8. If adjusting the focus knob does not focus the image, please click here for instructions on how to fix the focus ring.

Feb 02, 2011 | Avermedia AVERVISION 300AF+ PORTABLE...

3 Answers

My canon 18-55 lens will only take a picture in wide angle. as soon as i try to zoom at all it won't take a picture. it is 4 months old and hasn't been used much. and i haven't dropped it. any suggestions?

The Auto-Focus on the lens is damaged. I have had the exact same problem with my 18-55 and I ended up buying a new one because I take shots at weddings and I can't afford to manually focus each photo. You can still use it if you switch the small knob to MF and then use the focus ring for manual focus.

Jan 18, 2011 | Canon EF-S 18-55mm f/3.5-5.6 USN Lens

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

My eclipse security camera is out of focus.

should be 2 knobs on the lens itself. 1 is for zooming and the other is for focus. these knobs also screw into the camera to keep their position so you may have to unscrew them a bit before you can move them. adjust the focus knob (which should have a far-near directional arrow beside it) a little bit in one direction and recheck your picture.

Aug 22, 2009 | Eclipse Home Security

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 Optics

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

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