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Secondary spun!!!!!!!!! my sn8 secondary spun in the corrector plate !!!!?????how does this happen???!!!not tight enough to even adjust the mirror without thi happening!! how do ya re orient this properly??????????

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SOURCE: make the corrector plate meade 203mm

Meade will NOT sell you a corrector plate. They will want the scope back. The corrector plate must be matched optically with the mirror. It is VERY expensive to make this repair, and may not be economical to do. Call Meade:

Posted on Oct 18, 2009

SOURCE: I recently aquired the bottom part of a Meade

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

Posted on Mar 19, 2010

SOURCE: need corrector plate retaining ring gasket

These parts are only available from Meade, or if you find an old scope on that is being torn apart and sold as parts. You might find a replacement gasket at a well stocked hardware store--- maybe?

Meade customer service:

Posted on Aug 02, 2010

SOURCE: I need to replace

You have two choices.

1. Remove the mirrors and send them off to be recoated.

2. Buy a new primary mirror and a secondary mirror.

Here are some on line retailers:

Posted on Nov 02, 2010


You are NOT in focus. Turn the focus knob-- use the eyepiece with the largest number written on it until you learn how to focus. You can practice during the day time on a distant objects.

Posted on Jan 03, 2011

  • 227 Answers

SOURCE: secondary mirror

Answer would be too long here. See Mike Weasner's site below. Everything you wanted to know but were afraid to ask. I am not promoting, just a member.

Posted on Oct 22, 2011

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1 Answer

How to retrieve item dropped inside Celestron C8 telescope

Very Important! Mark the corrector with tape between the corrector and the side so you can put it back in the exact same place. Do NOT tilt the scope down or the eyepiece will slam into the secondary or the corrector plate, Remove the screws holding the corrector. A strong suction cup can help lift it out (will make a mark to be cleaned later.
Gently tilt the scope down to remove the eyepiece. Re assemble and you will probably have to collumate.

Oct 14, 2014 | Celestron C8-S 11025XLT (480 x 203mm)...

1 Answer

Focus knob will not work

The focus knob turns on a threaded rod which passes through a focus lever, which is secured to the back of the primary mirror. The end of the rod where it passes through this lever is secured by 2 jam nuts, one of which has probably fallen off.

To fix this you will have to take the front corrector plate off, find the nut rattling around in there, and tighten it back onto the end of the focuser rod, as shown in the diagram. I'd use a little Loctite as well.
This is not difficult, and you can clean the inside of the corrector plate while you have it off. The only precaution is to mark where the corrector plate was, and replace it at the same orientation. Some opinion has it as being worthwhile to also get the secondary mirror centered on the corrector, and the corrector then centered in the end casting. An accurate rule or vernier calipers can be used. Don't tighten the screws on the corrector plate retaining ring much more than hand tight.,214

Apr 29, 2012 | Celestron NexStar 4 SE Telescope

1 Answer

Lube stain on Secondary mirror on CPC 1100

Probably lubricant out-gassing which can collect than drip. Your choices are to contact Celestron service or do it yourself. DON"T PANIC! It is not that hard if you are brave.
1. Use a piece of masking tape on the corrector to the side of the housing.slice it carefully where they meet. This will insure correct alignment with the primary when you put it back together. (Correctors are sorted then oriented to,(as the name says) correct the primary.
2. Remove the corrector plate. Mark any shim locations with a marker on the outside of the corrector plate (remove after re-installation)
3. Make a solution of 50% distilled water and 50% isopropyl alcohol. (97% pure or better- I use 99% pure alcohol) 1 drop of dish detergent may need to be added,depends on the stain.
4. Rinse the secondary until grease is gone. Do not rub mixture on mirror, just keep rinsing.
5. Rinse with pure distilled water,gently stand corrector up to dry.
6. Assemble the scope. Use the same water/alcohol mixture to clean up the outside of the corrector. Dampen cotton balls and wipe with VERY light pressure.Wipe once, throw the cotton ball out and use a fresh one. Do not make the cotton balls too wet, you don't want moisture to get under the corrector.
7. If the stain is really tough, acetone may be used without damage to the mirror surface.
8. Use surgical gloves to avoid fingerprints.
9. Lots of towels at work area in case the corrector slips out of your grip.
10. If you put it together correctly, minimum collimation will be required.
There have been a number of these problems cropping up lately, I think Synta is using inferior grease now.If you are really brave, clean the old grease
off and add one drop of lithium grease. Run the primary through focus range a few times to distribute.
If you do this, you can later flock the inside of your scope to increase contrast.

Dec 29, 2011 | Celestron CPC 1100 GPS (XLT) (70 x 280mm)...

1 Answer

Loose nut inside telescope

Yuck! This is probably the primary mirror shaft nut. If you don't do anything it will eventually come off and smack the primary! This is not for the faint of heart. You must remove the corrector plate, reach down and CAREFULLY tighten the nut back up. The corrector plate is oriented to the primary. The manufacturer sorts corrector plates to mirrors. Before you remove the corrector, use masking tape to mark the exact placement of the corrector.(put the tape on the plate and the housing, then slice the tape at the edge). Might as well flock the inside of the scope while you have it open. It will increase contrast!

Dec 25, 2011 | Celestron NexStar 5 Schmidt Cassegrain...

2 Answers

I lent my Celestron 9.25 SCT to a friend and he said he had collimation issues. He said he couldn't find the collimation screws on the secondary so he unseated the retainer ring and pulled the secondary...

Yes because the corrector plate must be replaced in the exact position it was removed. There were probably also small paper or cork "shims" around the glass plate that must also be replaced exactly. Your friend messed up your scope most likely.

YOU DO NOT need to remove the corrector plate to collimate an SCT. The collimation screws are on the center of the plate and accessible from in front of the scope.

Mar 08, 2011 | Celestron CG9-1/4 9.25-inch Schmidt...

1 Answer

When looking thru any eyepiece, all I see is a blur-no matter the focusing adjustment. It's like looking into a fog. Yes, the front cover has been removed. This is driving me nuts. I have followed the...

This is a nice scope.
1. without an eyepiece, look into the eyepiece holder. You should see the secondary mirror and the reflection of the primary mirror in the secondary. If not, carefully align the secondary by either rotating the spider or GENTLY aligning the secondary screws (see collimating the scope in your instruction manual)
2. During the day, point the telescope to an object about 100 yards away, use the lowest power eyepiece (highest number) and see if you can focus on the object.

Oct 17, 2010 | Meade DS-2130ATS (250 x 127mm) Telescope

1 Answer

Have 8" bausch and lomb with busted corrector plate can I get A replace ment plate or do I have toglue the cracked one back together with optical epoxy or balsam resen

The corrector plate and the mirror were a matched set. Even if you found one on an OLD telescope you could not just swap it over to your scope.

If you did the collimation would never be correct and stars would all have "flares" and not be round. B&L does not repair these scopes.


Jun 26, 2010 | Telescopes

1 Answer

Make the corrector plate meade 203mm

Meade will NOT sell you a corrector plate. They will want the scope back. The corrector plate must be matched optically with the mirror. It is VERY expensive to make this repair, and may not be economical to do. Call Meade:

Oct 17, 2009 | Meade Telescopes

1 Answer

How to remove the corrector lens of a Nexstar 4

I would not try to remove the corrector plate-- the manual states to return the scope to Celestron if the inside of the corrector needs cleaning.

If removed the corrector has to be replaced in the EXACT position it was in before you took it apart-- the alignment between the front corrector plate and the rear mirror and the secondary mirror was done on an optical bench at the factory.

I doubt that will you notice or be able to see the small stain while you are observing--

Mar 15, 2009 | Celestron NexStar 4 GT (240 x 102mm)...

2 Answers

Fuzzy bright stars with my Celestron CPC 1100 XLT

The image shows that the optics are not centered properly. The secondary may be tilted slightly to the 2 o'clock position. When not centered, a focused star will have an astigmatic shape, and not come to a full focus. Also check the mirror and corrector plate for dewing, that will also affect the views.

Nov 02, 2008 | Telescopes

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