Question about Celestron C-14 A Telescopes w/ FREE UPS

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Celestron C14 focus rod unscrews rather thhan moving mirror up an

Celestron recently did a cleaning on my c.1980 C14 but someone forgot to put any padding in the trunk when they shipped it back. It bounced around roughly in the trunk. The focuser now unscrews outward rather than moving the mirror and collar up and down the central baffle. What do I do to free it and get the scope working again? I do not want to take the corrector lens off...

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Hi starHome: Looks like someone will have to remove the corrector plate and the rear cell to get to the focus bar on the primary mirror.once apart, then we will have more information to work with.
SHT55

Posted on Jun 28, 2011

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1 Answer

Focus knob turns but nothing moves


The Celestron manual for this scope has nothing to say, but on the underside of the focuser assembly, between the 2 focus knobs, you may see 2 screws.
They might be thumbscrews or some other screwhead type. One is the adjustment for the focuser internal clearance, or looseness, and the other is a focus travel lock.
If present, try backing both off 1/2 turn from tightness, and then experiment to see which is which. The focus lock will have no effect until tight, when the focuser will cease moving, as is now. The other screw will gradually remove looseness and rattle from the focuser until it just moves smoothly, with no back and forth loose feeling at the knob.
If neither of these screws is visible you will have to take it to a binocular and telescope shop, where they should not charge much.

May 02, 2012 | Celestron Optics

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

Broken focuser C8


I think the threaded shaft of the focuser has come right out of the hole in the focusing lever which attaches to the back of the mirror assembly. It should have a stop nut and jam nut at the end of the screw shaft which can be seen in this diagram
http://ngc1514.com/Celestron/disassem.htm

In my C8 these became loose, leading to excessive focuser slop. One of these has fallen off in yours. Unfortunately you will have to disassemble the scope to fix this, but it isn't difficult if you mark the alignment of the front corrector first.
http://www.astromart.com/articles/article.asp?article_id=594 http://www.darkatmospheres.com/music/C11_Project/index.html
http://www.flickr.com/photos/edhiker/tags/disassembly/
http://www.youtube.com/watch?v=da75gxuKMT8
http://www.laughton.com/paul/rfo/c11-disasm.html

You will be able to clean the inside of the corrector plate too. Follow up on this post with a comment if you have trouble.

Apr 28, 2012 | Celestron Optics

1 Answer

Focus knob problem


The focus knob is not supposed to feel like that. On my Celestron it had almost become detached from the focus lever which attaches to the main mirror inside the tube. There is a threaded shaft and locknut which had become loose.

If you feel DIY enough, and you understand about corrector plate centering, follow this

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

and tighten the locknuts on the threaded shaft. There is also a lot of stuff on CloudyNights (above) regarding this subject.

If not 100% confident a better idea is probably to have a telescope tech do this for you. Shop around your district.

Jan 21, 2012 | Celestron NexStar 4 SE Telescope

2 Answers

Celestron PowerSeeker 114AZ Telescope model 21056-K . . . we have collimated it but still cannot sight anything. Just black .... ideas?


Hi, I have the same telescope and also the same problem. Don't know if the black thing on the front of the telescope should be remove.

Dec 26, 2010 | Celestron PowerSeeker 114 EQ Telescope

1 Answer

HI, Just purchased a nextstar 8 and when I tried to view thru the main eye-piece, nothing. Even tried to look at the full moon, nothing again. Yes, all the lens caps are off but it seems like the focas...


Check the focus knob and make sure the small "set-screw" is tight and the knob is just not spinning around on the shaft.

DID you turn the knob enough to focus? Sometimes it may take 10 - 20 full turns.

Finally the focuser is attached to a "rod" inside the tube that moves the mirror back and forth to focus the scope. It could have come loose from the rod?

Instructions for disassembly are here:
http://www.celestron.com/c3/support3/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=2220

and here:

http://www.sciencecenter.net/hutech/misc/focuslk/index.htm this just shows how it works.

Oct 24, 2010 | Celestron NexStar 8i (600 x 203mm)...

1 Answer

My NexStar 8 SE doesn't focus. When the focuser knob is rotated either direction it moves the image up or down.


The knob could have come loose from the mirror. This would require a return to Celestron for repair or a complete disassembly of the rear of the scope,

You can remove the focuser, and MAYBE it is just detached from the rod inside that moves the mirror back and forth.

Celestron support:

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

Aug 01, 2010 | Celestron Optics

1 Answer

Could not see and focus the star in the eyepice (40 mm E-lux), althoght finder scope and main scope are aligned. I turned the focus knob full snti-clock then full clockwise but see no star. My turning was...


Did you ever see any "light" how about something that looks like a donut with a hole in it?

The focus know could have come loose from the "rod" inside that moves the mirror. OR the finder scope really is NOT lined up exactly with the main tube.

Take the telescope out during the day and see if you can focus on a distant object like the top of a telephone pole. If you can focus just fine, then the finder scope is NOT lined up with the view in the eyepiece. Also try using a lower power eyepiece -- anything over about 22mm to get a wider field of view.

Nov 22, 2009 | Celestron CPC 800 (480 x 50mm) Telescope

1 Answer

Problem focusing on distant objects


collimate your mirror.
sky and telescope shows you how to do it.
it's under 'Do-It-Yourself' section.

hope this helps :D

Aug 26, 2009 | Celestron AstroMaster 114 AZ (50 x 114mm)...

1 Answer

Focus?


The C8 optical tube has a very large focal range. It should be capable of focusing on objects from 15' to infinity. To focus on object at infinity you have to move the primary mirror foward. You do this by rotating the focus knob CCW. Rotate the knob CCW until it comes toa stop them slowly bring the mirror back by rotating the knob CW while viewing the object. It will snap to focus so don't move too fast yor you'll miss it.

Jun 25, 2008 | Celestron NexStar 4 SE Telescope

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