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

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ETX 125 Loose image when focusing

When i turn the focusing knob in and out the image iam loking at also moves around side to side.is this a repair i can do myself ?

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  • 68426 Jun 16, 2008

    the shift is bad when i have an object in the center of feild of veiw and then focus the image will go way out to the outer edge and will hang up out there untill i turn the knob some more.when i turn the knob counter clockwise it has same tension all the way,but when i turn clockise less tension and the knob easily can be wiggled up and down or side to side.

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The ETX family (and other Meade LX telescopes), use a moving mirror system for focus. The focus knob moves the main mirror in and out. For smooth operation, there is some slack on the central tube that allows the mirror to rock slightly as it moves. That is a normal condition, and the movement is magnified, the greater the magnification of the eyepiece.

Posted on Jun 15, 2008

  • Paul Moffat Jun 16, 2008

    Additional thoughts: if the image shift is bad, even at very low powers, then that may indicate a problem in the focus slide tube. That is the tube that the mirror slides on to focus. There have been reports that that tube may be loose in its' mounting due to poor thread engagement (their manufacturing tolerences are not too good on some parts) The solution is the dis-assembly of the telescope tube, and checking the focus tube for rigidity. If you do not feel like doing the work yourself, there are several service providers that can.
    If you want a delux service, go to:http://www.arksky.org/index.php?pid=33



  • Paul Moffat Jun 16, 2008

    The focus knob 'rattling' is also a common problem.That pertains to the bushings in the telescope housing that the focus shaft goes through. A tiny amount of end play is normal, but the bushings can become loose. The knob can be tightened by turning it counter clockwise until it feels more secure (1 or 2 turns). Then loosen the set screw on the knob and turn it clockwise just until some resistance is felt than tighten the set screw.

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I have a Orion Cassegrain spotting scope (D:90 F:500) that will not focus. The focus knob turns but nothing happens.


The small "pin" which moves the mirror inside may have either come loose or broken. You will need to remove the focuser to find out.

Visit the Mighty ETX web site for instructions on how to do this.

http://www.weasner.com/etx/menu.html

Feb 11, 2011 | Orion Optics

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

My focus knob does not work correctly, is this easy to fix?


There is a tiny set screw on the side of the knob. Make sure this is tight, and the knob is not just spinning around and around.

There is also a small rod inside -- that the focuser attaches to. If tightening the setscrew does not fix it, you will need to remove the focuser and see if it is detached from the rod. Make sure the scope is tilted BACK with the front of the scope UP a little or the mirror will slide to the front and possibly break.

This web site has lots of repair pictures--
http://www.weasner.com/etx/menu.html

Aug 09, 2010 | Meade ETX-125EC (500 x 127mm) Telescope

1 Answer

Etx cant focus


The LPI camera will HIGHLY magnify the image-- about like a 6mm -8mm eyepiece-- tiny adjustments are needed to focus. You can buy a .5 or .3 focal reducer which will widen the field of view and make it easier to focus--

On my LX90 --- it takes about 20 TURNS of the focus knob to go between the eyepiece view and the camera view!

Jan 11, 2009 | Meade ETX-125EC (500 x 127mm) Telescope

1 Answer

Can't focus on anything at all


Here is the manual-- read it cover to cover--
http://www.meade.com/manuals/TelescopeManuals/ETXtelescopes/ETX-90%20w-autostar%20man.pdf

1. Take off the lens cap

2. Put your lowest magnification eyepiece into the telescope on the TOP eyepiece port-- there is a lever on the side which rotates the diagonal mirror between the top and rear ports --- can you see light through the telescope? If not turn the lever.

3. During the day practice focusing on a distant object at least 100 yards away-- the image will be upside down -- this is not a problem-- no UP or Down in space.!

4. The lowest magnification eyepiece is the one with the LARGEST number on it.

Jan 02, 2009 | Meade ETX-125EC (500 x 127mm) Telescope

1 Answer

LOOSE FOCUS SHAFT


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

Jun 20, 2008 | Meade ETX-125EC (500 x 127mm) Telescope

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

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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