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?

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

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.

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.

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

You can try calling Meade here:

http://www.meade.com/support/index.html

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.

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!

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.

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

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.