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Telescope knob The telescope knob used for adjusting the focus is comprised of the knob which connects via an allen screw to a threaded peice that connects to the telescope the knob portion I have but the piece of threaded screw is the one missing.

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Still not enough information, but taking a stab at it, I'll assume you mean the pinion rod that goes between the focus knobs, and engages a gear rack on the focuser. There are locations where they can be purchased, and you would need to provide the OD and pitch (teeth per radian) to match.
Try: http://www.pinionrod.com/ as a source.

Posted on Jun 13, 2008

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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 Telescopes

1 Answer

The focus knobs wouldn't retract the eyepiece and so in my infinite wisdom I tried to unscrew the whole eyepiece assembly by loosening the 3 screws that appeared to attach it to the main body. Well...


Focusers can be replaced and or upgraded-- you disassembled the focuser-- you will need to reassemble it properly -- you might have also messed up the screw threads in the holes and may need to try using a slightly larger size screws. Your local hardware store will have them.

www.telescopeman.org
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Jul 29, 2011 | Tasco 49114500 Spacestation(r) 114mm...

1 Answer

Hi, Original focus knob fell off my atx 70 and now the 'focus rod' goes inside the telescope instead of moving front part. Is there any way to fix it?


The knob had a tiny set screw on the side of it-- that tightened down on the shaft.

See if you can tighten it back up. If it is missing take it to a well stocked hard ware store and see if you can find a replacement Allen style set-screw.

Apr 06, 2011 | Meade ETX-70 (240 x 70mm) Telescope

1 Answer

.comMy Meade Polaris Telescope is


go to your local hardware store and find one that fits!

Sep 07, 2010 | Meade Polaris 114EQ-D (36 x 114mm)...

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Focus knob is jammed. what do i do to release it?


There is a tiny allen screw on the side of the knob tighten this -- small screw

Aug 15, 2010 | Meade ETX-80AT (240 x 80mm) Telescope

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Need replacement parts for astrolon reflector 525X telescope. 1 Yoke Lockig Knob (missing) 1 screw on the yoke which is to hold the "Fine adjustable altitude control" lever. and might need to replace the...


They do not sell parts for these low cost telescopes. However you might find what you need inn the bolt and nut section of a well stocked hardware store.

This brand is sold by Toys R Us--

Apr 18, 2010 | Edu-Science (10166) Telescope

4 Answers

Can't focus my telescope


If there is nothing on the objective lenses or eyepiece lenses then it most likely needs collimation. This is where you adjust the secondary mirror while viewing an out of focus star. You need stable sky conditions to do this.

There are most likely three small screws at the front of the telescope and these are what you use to adjust it. As one screw is loosened then another is tightened. Do this in very small increments. If you have your manual it should outline how to perform this. If not go to this web site: http://www.astrosurf.com/legault/collim.html. It will show examples of how objects look both in and out of collimation. There is a section further down the page for SCTs.

A very handy tool for this is to replace your screws with Bob's Knobs (http://www.bobsknobs.com/) . These replace the screws and allow you to adjust it by hand instead of a screwdriver.

The other focusing problem I've experience with my Celestron SCT is to have the focus knob loosen up and then slip as I turned it so that I could never focus with it.

Good luck and clear skies!

-jodair

Mar 29, 2009 | Meade Telescopes

1 Answer

Loose image when focusing


The focus knob can have the play reduced. Turn counter-clockwise a turn or 2, then loosen the knob's set-screw and carefully turn clockwise until a little drag is felt. Then tighten the set-screw.
A further item that may pertain to image shift, especially at low powers, is that the baffle tube that the main mirror slides on, may be loose in the back housing. There have been reports of poor thread engagement due to poor tolerences. That tube can be re-tightened - just be careful not to strip the threads!.

Jun 16, 2008 | Meade ETX-125EC (500 x 127mm) Telescope

1 Answer

Can't get to focus.


I think that the focus shaft has become un-attached by turning too far. Try placing the telescope facing directly upwards and start turning the focus knob clockwise. A little vibration on the tube will help the mirror to settle downwards. This may get the threaded rod back into the knob.

Jun 15, 2008 | Meade ETX-125EC (500 x 127mm) Telescope

1 Answer

Inoperative focus control


I'm assuming this is the Maksukov-Cassegrain telescope. Turning the focus knob CW should get you focus at infinity by moving the primary mirror away from the eyepiece. As you turn the knob it should move in and out relative to the real of the scope. If that's not happening the focus screw may have been turned CW too far and no longer be catching the threads in the rear plate of the scope.

You may be able to get it to rethread by holding the front of the scope toward the ceiling and turning the knob CCW. Attached is a photo of what the scope looks like under the rear housing. To prevent the focuer shaft from turning in too far the knob should be firmly seated agains the rear of the shaft. I think on this model this is a friction fit.

HTH, George
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Jan 23, 2008 | Telescopes

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