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

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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

Posted on Aug 01, 2010

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1 Answer

How to fix when rotating the fine focus knob until it reach the limit of motion and the coarse focus knob get stuck and can only move in very small range.


Based on the fact its a E600 i would suggest to have a engineer look at it : prices range from £120 dependant on your location if you visit www.ukmicroscopy.co.uk they will be able to help

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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 cannot see anything from the viewer. it all appears black


Take the scope outside during the day time and practice focusing on a distant object. Use the eyepiece with the largest number written on it --- turn the focuser left and or right slowly until you get a sharp image. DO NOT use the 2 x barlow if you have one -- just the eyepiece. The higher the magnification the smaller the "sweet spot" is when focusing.

Jan 13, 2011 | Celestron NexStar 4 SE Telescope

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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

The small knob that moves the slideto the left or right on the platform (the one furthest from the observer) is slightly loose, and instead of rotating in a smooth circular motion it rotates rather...


The knob you are talking about is called the x-axis control knob. It does not directly affect the focus. What affects the focus is the slight manipulation of the stage and or slide while you are adjusting the x-axis control knob. It only takes the slightest pressure to throw the focus off very far. Theoretically you could completely remove the specimen holder and move the slide around with your fingers.
The specimen holder may need to be replaced but without further more detailed knowledge of the mechanical problem I cannot instruct further.

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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.


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)...

1 Answer

Black dot.


Ensure focusing is spot on. if your image is a black dot surrounded by white light (like a doughnut) then your not in focus. Look at making a Hartmann Mask (really easy, just google for it), which fits over the front lens. It has 2 or more holes in it,this means when you look through the eye piece you will see double images, adjust focus until the images merge into one (if the images go further apart turn the focuser the other way), when they are merged remove the mask and presto you should be in optimum focus. Always remember telescopes are very sensitive and focussing requires delicate adjustments.
Regards and Clear Skies
Carl

Dec 26, 2007 | Celestron NexStar 4 SE Telescope

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