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Can't bring reflector telescope to focus.

I received a reflector telescope for Christmas, the clouds finally receded last night and I tried it out.

I can't bring the thing to focus though. The 'scope came with two eyepieces, a 10mm and 17mm "Super-Plössl". With either eyepiece in and, I presume, a star centred I only see the image of the secondary mirror struts highlighted against the primary.

I discovered that if I slide either eyepiece almost completely out of the drawtube (which is at full extension), I can get an image of the sky. I thought eyepieces sit completely in the drawtube though, not halfway or more out, grasped by the single fixing screw.

Is there something fundamentally wrong with the telescope? Does it just require collimation or somesuch?

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  • Chimney Jan 03, 2009

    Sorry for the lack of details. I'm sure I entered the make and model in a couple of fields in the problem submission form though :)

    It's a Newtonian, Orion Optics Europa 150 f/5 deluxe - here's the product page for it.


  • Chimney Jan 30, 2009

    The extension tube worked perfectly, thanks.

  • David Duffell
    David Duffell May 11, 2010

    Hi,

    is this a Newtonian or cassagrain. If you can give me some details of make etc. I'm sure I could help,

    Kind regards.....dave

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  • 44 Answers

Orion UK has a very good reputation so I'm surprised you are having a problem. However, I see they are offering this with a Crayford focuser. Most Crayfords have a lower profile than traditional rack and pinion types and they may have failed to realize this could effect back focus. If the scope is new I'd talk to them. If not, find a 2" long by 2" diameter focuser extension tube.

If it does have a traditional rack and pinion focuser it may be missing the extension tube. Many of this type have a threaded on extension tube which is used for visual work and removed for use with a 35mm camera. The solution's the same.

Posted on Jan 07, 2009

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http://www.telescope.com/control/product/~category_id=classicdobs/~pcategory=dobsonians/~product_id=09804

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Buy these two books, Turn Left at Orion, and Nightwatch. Local a local Astronomy club to help you with your telescope.

Read these:
http://www.texasastro.org/telescope.php

http://vimeo.com/channels/tas


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Can you focus on a distant object during the day time? Use the eyepiece with the largest number written on it and DO NOT USE the 2x barlow if you have one. Try focusing during the day time. If this works your telescope is OK. Then try the moon at night as your first target.

If you can see the moon up close all is OK.

Read my TIPS on my profile page.

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http://www.telescope.com/control/product/~product_id=08943

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1. Forget about the barlow--- since this scope has a very small aperture you will not be able to get much more than about 125 power-- if you try to use the barlow which DOUBLES or TRIPLES the power of your eyepieces the images you see will be degraded and it will be VERY hard to point the telescope and focus.

2. Put the eyepiece with the largest number (which is the lowest magnification) into the telescope and take it outside during the day and practice focusing on a distant object.

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4. The smaller telescope is the finder scope and mounts on top of the main telescope tube. Use this to point the main telescope------- but you must first line it up on a distant object so that the small telescope and the big tube are both pointed exactly alike.

5. Try to find a local astronomy club and attend one of their star parties.

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http://www.meade.com/manuals/TelescopeManuals/Reflectors/Meade114STEQ-D.pdf




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2 Answers

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