Question about Celestron C130 Mak (63x130 mm)

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I can't focus, i don't see nothing!!

Hi!
i have a celestron c130 mak..i'm a new user
Please tell me how can see i move the focus knob and nothing occurs. i'm tried with the land use, do you have a manual more easy for me??

HELP!!!


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  • 112 Answers

Are you putting the eracting system on first?

Posted on Nov 30, 2008

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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

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

1 Answer

Nexstar 6 can not focus on moon. seems like focus knob does not move counterclock wise enough


The focuser may be broken. Contact Celestron for repairs here:

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

Jan 17, 2011 | Celestron NexStar 6 SE (354 x 55.88mm)...

1 Answer

Ihave bought Nextstar SE4. I aligns and moves but i cant seeanything from the eyepiece. In day light i can see brightwite background but no image. Please help


Put the eyepiece with the largest number written on it into the focuser. This is your lowest magnification.

During the day time point the scope at a distant object and practice focusing -- you may need to turn the focus knob several times right or left to achieve focus.

It will focus if you turn the knob enough.

Jan 14, 2011 | Celestron Optics

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

Focus knob on Celestron NexStar 5 does not appear to be working. Knob still moves but does not sharpen the focus.


Does the focuser move in and out when you turn the knob? If it does then go outside during the day timne and practice focusing on a distant object. Use the eyepiece with the biggest number written on it.

This will give you the lowest magnification-- which is easier to focus.

Aug 02, 2009 | Celestron NexStar 114GT (269 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

1 Answer

Focusing Issue


The screws should be short enough not to stop the primary's travel, but pull them out and try it again. Good luck! George.

Jun 25, 2008 | Celestron NexStar 11 GPS (660 x 279mm)...

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