Question about Tasco 600X60mm Astronomical Refractor Telescope

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Unable to focus telescope

Focus part at rear is missing. ie that part which engages with the toothed adjustment knobs

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You never said what type of telescope you have???? While you can buy replacement focusers they are expensive and probably not worth doing. Here is a link to some replacement focusers.

http://www.telescope.com/control/category/~category_id=focusers

Posted on Sep 09, 2009

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Hello, I have a celestron c9,25. I adjust a nikon D3100 with T-Ring and Adapter to my telescope. Firstly I focus to moon, using an eyepiece, then I removed the eyepiece and adjusted the Nikon. The...


Because the camera has a different focus point from the eyepiece. TURN the focus knob until the camera comes into focus. OR you can buy a "focus ring" for the eyepiece which attaches to the barrel of the eyepiece and is adjustable-- then focus with the camera FIRST and then insert the eyepiece with the ring on it and lift it UP until the image comes to focus-- then tighten the ring. NOW you can use that eyepiece to roughly focus the camera.

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

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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 Optics

1 Answer

Unable to see out telescope, might be missing a lens


You need a "diagonal" and an eyepiece on the "small end" of the telescope-- where the focus knobs are located.

Do you have these pieces? If you do put the eyepiece with the LARGEST number written on it into the diagonal and then put the diagonal into the telescope. The bigger the number the LESS magnification.

Go outside during the day and practice focusing on a distant object at least 100 yards away --- the lower magnification helps you learn how to focus.

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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.

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Telescope knob


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.

Jun 13, 2008 | Optics

2 Answers

Focus knob screw


Not enough information to answer question.

Jun 04, 2008 | Optics

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
7793c63.jpg

Jan 23, 2008 | Optics

1 Answer

Focus Issues


Try tightening the grub screw that fastens the knob onto the shft that it turns.

Better still, buy a flexible extended focusser which makes focussing much easier. Check on eBay for "Meade flexible focus"

Sep 27, 2007 | Meade Telescope

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