Question about Meade ETX-90 (48x90 mm)

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ETX-90 Focus My telescope was working properly before it was moved to Florida by a moving van. I can not now get the telescope to focus properly. I have tried adjusting the focus knob but no luck. I am also not sure if the eyepiece has been tampered with or not. Is there an illustration showing how the lenses should be placed in the eyepiece?

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I suggest trying a different eyepiece first to see if that's the problem. Otherwise, if it was moved without adequate protection, there is a chance the mirror was shifted or damaged. A damaged mirror can't really be fixed since it's specs are very rigid. If it turns out to be a problem with the mirror the best thing to do is find an expert on telescope mirrors to try and fix the problem.

Posted on Nov 12, 2007


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Cannot focus the ETX-90. Feel no resistance when I try.

There is a small (tiny) set screw on the side of the knob. Make sure the screw is tight.

Jul 26, 2011 | Meade ETX-90EC (325 x 90mm) Telescope

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I purchased a Meade ETX 90 EC 325X90 MM Telescope at Christmas for a friend of mine. When he went to set it up on the tripod, he said that the focus button was loose and it would not adjust to focus in. ...

It is very simple.Their is one shaft appear near eyepice.please you go at electronics componant shop and buy a knob which is suitble to fix.You focus button ready to work.

Jul 09, 2011 | Meade ETX-90EC (325 x 90mm) 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

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.

Feb 11, 2011 | Orion Optics

1 Answer

Need a focus knob for a MEADE ETX-70 TELESCOPE

You can try calling Meade here:

Apr 15, 2010 | Meade ETX-70 (240 x 70mm) Telescope

1 Answer

Can't Focus

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.

Jan 25, 2009 | Meade ETX-125EC (500 x 127mm) Telescope

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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!

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--

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


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

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

1 Answer

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.

Jun 15, 2008 | Meade ETX-125EC (500 x 127mm) Telescope

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