Question about Meade 8" LX90 LNT Schmidt Cassegrain Telescope with SmartFinder w/ FREE UPS

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Meade LX200R 12" Mirror Lock

Meade says to turn the mirror lock to the lock position after focusing. They state not to tighten to much, just firm. When I turn mine to the lock position it acts like it hits a stop - does not get snug - is this correct" How does the mirror lock work and is ther anywhere I can get an exploded view of the scope?

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Re: Meade LX200R 12" Mirror Lock

The 'lock' is a ring gear that closes a ferrul against the draw tube to restrict its motion. It is not intended to be a hard lock. Try the Meade Advanced Users Group for further tips.

Posted on Jul 25, 2008

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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 Telescopes

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Procedure to set up a meade 12" LX200R on

It's pretty much all spelled out in the manual. Here:

You should train the drives, and purchase a separate 12 volt power pack with the correct cigarette lighter style power cable. Calibrate motors BEFORE you train the drives with the same power source you will use outside at night.

If this is a GPS model-- and new--- I would execute a RESET on the hand controller-- calibrate motors and train the drives and take the scope outside and get a Satellite link and do a two star automatic alignment.

Make SURE you are centering the correct alignment stars. By the way TRAINING must be done in alt az mode before you put the scope on a wedge-- it cannot be done in polar mode.

Sep 18, 2011 | Meade 12 Inch LX200R f/10 Advanced...

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I just had my lx 200 acf 12 inch [new telescope] returned to me from Meade because there was dirt on the mirror. After setting it up I discovered the locking mechanism would not unlock nor could i turn...

You can try removing the focuser and knob -- and see why the LOCK (which is simply a bolt is stuck.

Look here:

May 21, 2011 | Meade LX200GPS Telescope

1 Answer

When I use my telescope and lock in the coordinates all I can see is the cross hairs covering up what planet im looking at.

In the finder scope or in the main tube?

If you cannot see it in the main tube you are NOT in focus--- you are seeing the secondary mirror and metal bracket holding the mirror-- practice focusing using the eyepiece with the largest number written on it.

Read my tips on my profile page.

Jan 15, 2011 | Meade DS-2114 ATS (325 x 114mm) Telescope

1 Answer

Here?s my problem : My scope model is LX200R 14?. I?ve pulled the focuser shaft out of the focuser arm pin. I?ve turned the locking lock knob several turns before putting back the focuser shaft. I...

Steward, this is Joe Lalumia-- I have seen your post on various forums. The 14 inch is different from the other smaller LX200 scopes.

Probably Dr. Clay, and or Andrew on the Yahoo Group LX200 forum will know the answer because they service these scopes.

Post a message there (register for free) and one of them will answer you about that very nice scope.

Clear Skies!


Dec 14, 2010 | Meade LX200R 14 in. Telescope

1 Answer

I recently aquired the bottom part of a Meade Lightbridge 10" Truss Dobsonian Telescope. This includes the Primary Mirror & tube that contains it plus the 3 Struts and not much else. I think I can make...

Try posting this question on the FORUM, either in the REFLECTORS topic, and or ATM, Optics Topic.

Someone will answer you with the exact dimensions You can also post a Free Classified ad there -- a WANTED ad looking for the entire missing top section, Meade "may" also be willing to sell you this.

Clear Skies

Mar 18, 2010 | Meade LightBridge 10 in. Standard (600 x...

1 Answer

Turning the focus knob on my Meade LX50 Schmidt-Cassegrain Telescope does not change the focus; does not move the primary mirror. I need an exploded diagram and/or step by step instructions on how to...

The focuser has probably come loose from the "rod" on the mirror.

Here is the focuser disassemble instructions:

and this shows how to disassemble the main tube-

Jan 03, 2010 | Meade LX50 (8105003) (500 x 203mm)...

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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.

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

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Mirror lock

Possibly the shaft has jammed. Follow this link for a source of good information:

From their files:
The locking knob has a gear on the inside end of its shaft. It engages teeth on the outside edge of a large metal disk connected to the mechanism that locks the position of the mirror on the central baffle tube. Rotating the locking knob one direction rotates the large disk to tighten the collet on the central baffle. Reversing direction loosens it.
The teeth do not extend all the way around the large disk. So sometimes the locking knob gear jams to a stop before the lock is fully engaged. Soon after the GPS scopes first started shipping Buck Harley discovered that in such cases you can remove the locking knob with its shaft and gear, then reach in and rotate the large disk with your finger. Replacing the locking knob will now allow sufficient rotation to fully engage the lock. If you happen to move the large disk in the wrong direction, then just repeat the process and move the disk in the other direction.
You don't need to tighten the lock down hard. Just a little snug is enough. You should not attempt to use the coarse focus knob while the mirror is locked. Damage to the focusing mechanism could result.
This design is intended to precisely hold the mirror position. So, yes, it is meant to allow effective use of a separate guide scope by eliminating mirror flop when in the locked position.

May 26, 2008 | Meade LX200GPS Telescope

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