Question about Meade ETX90AT Maksutov Telescope with UHTC (cat35140321)

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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?

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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.

Posted on Aug 19, 2010

  • duckpondale May 14, 2011

    if you cannot see anything then you need to turn the mirror up with the two silver knobs on the side

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1 Answer

Use meade 644 flip mirror system


Need more information- several Meade scopes have a flip mirror like the ETX 90 for example. Usually it is in the position to use with an eyepiece. However it can be flipped so the rear port can be used on the telescope.

Hope that helps. There is a known issue with these old flip mirrors- the adhesive holding the mirror can fail. You must disassemble the scope and apply new adhesive to hold the mirror in place.

Dec 03, 2014 | Meade Optics

1 Answer

Telescope doesn't seem to work


This issue will be extremely hard to diagnose over the net but I'll give it a try. This is from Meade. The link to the online manual is below: http://www.meade.com/manuals/etx90ec/index.html Unable to see an image through the eyepiece:
  • Confirm that the lens cover has been removed from the telescope.
  • Confirm that the flip-mirror control (16, Fig. 1) is in the "up" position if using the eyepiece holder (4, Fig. 1) so that light is directed to the eyepiece (1, Fig. 1). Confirm that the flip-mirror control is in the "down" position if using the #932 Erecting Prism or doing photography with the ETX-90EC (see Telescope Controls and PHOTOGRAPHY WITH THE ETX-90EC).
It sounds like you are correct about a mechanical issue with the knob that moves the mirror. If you need a quick fix try your local camera repair or watch repair shop as the are familiar with intricate parts. The camera shop would be preferable as they know optics. Otherwise you could ship it to me and I could repair it fro you depending on the availibility of parts if parts were needed. Check my picture for my site address and get contact info there for more information.

Jan 05, 2008 | Optics

1 Answer

I have an older model meade etx astro telescope i see nothing but black when looking through my telescope..the lense cover is off...the mirror is in the up position like it should be....its nothing but...


Can you see Light through it during the day time? If you can nothing is wrong. Put the eyepiece with the largest number written on it into the TOP and try focusing on a distant object during the day time.

Turn the focus knob until you get a sharp image.

Feb 26, 2011 | Meade ETX-60 AT Telescope

1 Answer

When I look through the lense everything is just black


Take the scope outside during the day time. Put the eyepiece with the largest number written on it into the TOP diagonal. There is a "flip" switch on the back that changes between the rear photo port to the TOP eyepiece port.

Flip it one way or the other until you can see light through the TOP eyepiece. Practice focusing on a distant object during the day time.

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

Dec 15, 2010 | Meade ETX-90EC (325 x 90mm) Telescope

1 Answer

2 small lens fell out of my telescope how do I get them back in and where do they go ??


The Meade ETX90 does NOT have small lens! It has a large curved lens in the front. and a holder for the eyepiece in the back (top). There is also a camera port in the back, and a flip lever that sends the light either straight back to a camera, or UP to the eyepiece holder.

There is an INTERNAL secondary mirror mounted on the back of the front large lens. If this fell off INSIDE, you will need to remove the front lens to fix it. NOT an easy fix as the optical alignment can get messed up when you do this.

Here is the manual for an ETX90, you should read it completely.

http://www.meade.com/manuals/TelescopeManuals/ETXtelescopes/ETX-90_105_125EC_man.pdf

and for the hand controller:
http://www.meade.com/support/etxautofaq.html

Jun 18, 2010 | Meade ETX-90EC (325 x 90mm) Telescope

1 Answer

Can't focus using 5mm lens


TOO much magnification for that 3 inch telescope. The most you will get is about 120 power or so on perfect sky nights. Try a 10mm or 9 mm as your most powerful eyepiece.

50 times aperture is the maximum possible.

Jan 19, 2010 | Meade ETX-125EC (500 x 127mm) Telescope

2 Answers

Image is upside down


A telescope sees that way. you have to have a corrective lens to right the view. Its a physics thing about how light goes thru a lens and at the lens flips over upside down, you need another neutral lens to flip it right side up again. If you got the entire kit try another lens till you find the corrective lens.

Jul 05, 2009 | Meade ETX-90EC (325 x 90mm) 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

ETX-90 Focus


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.

Nov 12, 2007 | Meade ETX-90 (48x90 mm)

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