Guide :Optics : ETX-125EC (500 x 127mm) Telescope


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 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.

Research, Knowledge and Information :


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Need help with loose focuser - Binoculars - Cloudy Nights

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Suggested Questions And Answer :


OK, that model has an internal adjustment. A good source for all kinds of information and tips on the ETX series is available from:
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ETX 125 Loose image when focusing

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.
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Can't Focus I just bought a Made etx-125ec from a friend.  I locked onto a bright star and turn the focus to each extreme and cannot get the object in focus.  I was curious if it is possible for someone to damage the focus mechanism by turning it too far.

The focus screw can come out if run too far. Point it straight up, give the side of the optical tube some light 'thumps' and turn the focuser clockwise. You should be able to see the mirror moving backwards in the cell.
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Focus. Knob is tight - Meade ETX-125EC (500 x 127mm) Telescope

Remove the OTA from the rear cell; unscrew the focuser shaft about half way (CCW) and remove the knob or electric focuser unit; there are three very small hex cap screws which hold the OTA into the rear cell; remove these and save in a tuna can or similar, because they WILL get lost if you place on the countertop. Once done, merely grasp the blue OTA in one hand with a rubber glove for grip and the rear cell/fork arms in the other hand and pull gently NOT twist while separating! You will see where the threaded focus rod inserts into the OTA....typically binding is causing the shifting, but most of this is due to poor milling by Meade on some 125 models. You can improve these imperfect models greatly, but do not expect to eliminate all focus shift. Run the focus rod gently all the way CCW until you feel NOT force or you will damage. Once there apply a thick grease, such as pure white Lithium (available in the tool dept. at Lowes) in a very thin layer, pushing hard into the NOT apply too much or you risk getting this stuff on the optics eventually. Once done, put the knob on the rod temporarily and run it in and out all the way slowly about 3-4 times. Once done, run it HALF-WAY between all the way and all the way out and stop. At that position, turn the OTA to about a 45-degree tilt, with corrector down and put 1-2 DROPS of 3-in-1 oil right where the threaded rod goes into the threaded rear cell of the scope and QUICKLY run the focuser CLOCKWISE to get that thin bit of oil into the rear cell threads. Once done, run the threaded rod slowly all the way CW and then CCW about 2 more times. This procedure will greatly improve the performance....NOTE: do NOT put more than 2 drops of oil on the rod!
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Can't focus my meade etx-125. have turned focusing control more than 80x in both directions. Is there an stop on the focusing system. Originally had the electric focusing system on the scope couldn't focus then either. I have tried both indoors and out doors.

Yup there is a mechanical stop to prevent you from cracking the mirror by retracting or extending it too far.. once you break the pin off it needs to go to the factory for dis-assembly as they have to remove the primary to get to it and realign it my 105 did same thing....word of advise use a cable extender for focus not an electric focuser they fail to tell you that it can over run the built in stops making your scope useless...i may be mistaken but i believe the max turns is 25 or about for end to end focusing adjustment on the 125
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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!
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Meade ETX-125EC Telescope Problem

Well, when I got the unit, indeed it would not power up at all. I could see no burning or signs of arcing.I looked online for an internal picture of the drive and fitted the cables back in according to the image.Tadahhhh, one working drive, only works on the 12v though, Batteries wont work although I have measured the voltage and they are all fully charged. Seems the previous owner had removed the looms and put them back incorrectly.
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The telescope will not move up and down - Meade ETX-125EC (500 x 127mm) Telescope

You do have fresh batteries? Does the light come on -- on the control panel? Does the hand controller light up?We need more information to answer you-- but for repairs you will need to return it to Meade. Call them here:
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