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

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LOOSE FOCUS SHAFT

On this model the set screw is only to put on or remove the knob from shaft. there is no adjustment.the shaft has good tension when turning counter clockwise but turning clockwise easier to turn and easy to wiggle up & down & side to side.i compared it to my etx 90 and it has good tension in either direction and can not be wiggled around.so how do i take it apart definatly a problem on the inside. have you taken these models apart before.its a ETX 125 premier edition. THANKS.

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OK, that model has an internal adjustment. A good source for all kinds of information and tips on the ETX series is available from:
http://www.weasner.com/etx/menu.html

Posted on Jun 21, 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

Focus knob problem


The focus knob is not supposed to feel like that. On my Celestron it had almost become detached from the focus lever which attaches to the main mirror inside the tube. There is a threaded shaft and locknut which had become loose.

If you feel DIY enough, and you understand about corrector plate centering, follow this

http://ngc1514.com/Celestron/disassem.htm

and tighten the locknuts on the threaded shaft. There is also a lot of stuff on CloudyNights (above) regarding this subject.

If not 100% confident a better idea is probably to have a telescope tech do this for you. Shop around your district.

Jan 21, 2012 | Celestron NexStar 4 SE Telescope

1 Answer

Hi, Original focus knob fell off my atx 70 and now the 'focus rod' goes inside the telescope instead of moving front part. Is there any way to fix it?


The knob had a tiny set screw on the side of it-- that tightened down on the shaft.

See if you can tighten it back up. If it is missing take it to a well stocked hard ware store and see if you can find a replacement Allen style set-screw.

Apr 06, 2011 | Meade ETX-70 (240 x 70mm) Telescope

1 Answer

Here?s my problem : My scope model is LX200R 14?. I?ve pulled the focuser shaft out of the focuser arm pin. I?ve turned the locking lock knob several turns before putting back the focuser shaft. I...


Steward, this is Joe Lalumia-- I have seen your post on various forums. The 14 inch is different from the other smaller LX200 scopes.

Probably Dr. Clay, and or Andrew on the Yahoo Group LX200 forum will know the answer because they service these scopes.

Post a message there (register for free) and one of them will answer you about that very nice scope.

Clear Skies!

Joe

Dec 14, 2010 | Meade LX200R 14 in. Telescope

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

Just got a Meade ETX 90 and cannot see anything thru the eyepiece. I've tried the focus screw, lens covers are off, and flip switch is in correct position. Anyone know the answer?


Put the eyepiece with the largest number written on it into the TOP of the scope eyepiece holder.

Practice focusing on a distant object during the daytime. It may take several turns of the focuser know.

Also check the TINY setscrew on the side of the focuser knob. It may be loose and need tightening so it will GRIP the focuser shaft.

Aug 19, 2010 | Meade ETX90AT Maksutov Telescope with UHTC...

1 Answer

Loose image when focusing


The focus knob can have the play reduced. Turn counter-clockwise a turn or 2, then loosen the knob's set-screw and carefully turn clockwise until a little drag is felt. Then tighten the set-screw.
A further item that may pertain to image shift, especially at low powers, is that the baffle tube that the main mirror slides on, may be loose in the back housing. There have been reports of poor thread engagement due to poor tolerences. That tube can be re-tightened - just be careful not to strip the threads!.

Jun 16, 2008 | Meade ETX-125EC (500 x 127mm) Telescope

2 Answers

Focus knob screw


Not enough information to answer question.

Jun 04, 2008 | Optics

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

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