Question about Celestron NexStar 114GT (269 x 114mm) Telescope

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

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  • Richard Jun 16, 2011

    Hi, I have the same problem as you do, I just wanted to know if you were able to figure out what was wrong? thank you.

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  • 3,186 Answers

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.

Posted on Aug 04, 2009

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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 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

I have a nexstar 6 SE and before my wife and I even used it once,some jealous idiot started playing with it in the extra room,and turned the manual focus adjustment knob so far in one direction that He...


Contact Celestron for replacement parts here:
http://www.celestron.com/c3/page.php?PageID=37

See if they have one.

You can also send it back to them for repair.

Nov 23, 2010 | Celestron NexStar 4 SE 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

When viewing venus or other stars there a black spot in the center of the object. It appears to be the 2nd mirror refleting to the main miror. what have I done incorrect?


You are NOT in focus. Turn the focus knob a little until you see a perfect "disk" for the planet. Stars are always POINTS of light, with a telescope or without a telescope.

Aug 28, 2010 | Celestron NexStar 114GT (269 x 114mm)...

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

I have the Nexstar 8. It will not auto align or manual....


First do a RESET on the hand controller and make sure TIME, DATE, and SITE, are correct.

If this does not work then RE-load the firmware in the hand controller. If that fails contact Celestron customer service.

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

May 15, 2010 | Celestron NexStar 102 SLT 102 mm (4.0)...

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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