Question about Meade LX50 (8105003) (500 x 203mm) Telescope

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What is the best way to clean the corrector plates on these telescopes?

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Make sure it actually DOES need cleaning and follow these instructions:

http://www.astro-tom.com/tips_and_advice/cleaning_optics.htm

Posted on Mar 23, 2011

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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.
http://ngc1514.com/Celestron/disassem.htm

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.
http://www.astromart.com/articles/article.asp?article_id=594

http://www.darkatmospheres.com/music/C11_Project/index.html

http://www.celestron.com/c3/support3/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=1655&nav=0,214

http://www.nexstarsite.com/OddsNEnds/SCTCorrectorRemoval.htm

http://www.laughton.com/paul/rfo/c11-disasm.html

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...

1 Answer

Hi, Could you please tell me where I might be able to get my Celestron Nexstar 11 GPS Telescope repaired? The corrector plate needs to be replaced. Is there anyone that could help with this? Regards,...


The scope will need to be returned to Celestron. The Corrector plate must be matched to the rest of the optics inside the tube. This is an EXPENSIVE repair ! Call Celestron here:

http://www.celestron.com/c3/page.php?PageID=37

Feb 03, 2011 | Celestron NexStar 11 Telescope

1 Answer

How do you clean tne inside of a meade telescope lx200emc lens that has spots possible moiture spots


The corrector plate at the front needs to be removed. Read this article. It must replaced in the EXACT position that is was before you disassembled it--

http://www.astromart.com/articles/article.asp?article_id=594

Jan 18, 2011 | Meade LX200GPS Telescope

1 Answer

25 white spots on the inside of the corrector plate


This is mold growing on the inside of the glass plate-- you will either need to send it back to Meade for cleaning or clean it yourself.

See this web site:

http://www.astromart.com/articles/article.asp?article_id=594

and this article for cleaning optical surfaces:
http://www.televue.com/engine/TV3_page.asp?id=103

Oct 10, 2010 | Meade LX200GPS Telescope

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:

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

Oct 17, 2009 | Meade Optics

2 Answers

Dirty primary mirror


Nice telescope! I clean mine with a dust blaster, those canned air things.They are cheapest from Sam's Club, if you have those near you.Be careful if you decide to use swabs, you may scratch the mirror or remove the special coatings on the mirror.Try the canned air first.If you do use a swab, exercise great care.Use nothing metal.Maybe a long plastic spatula with a soft , lint free cloth.No solvents.Good Luck

Mar 25, 2009 | Meade 8" LX90 LNT Schmidt Cassegrain...

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)...

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