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Thread: Celestron Zoom

  1. #1
    Jovian's Avatar
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    Default Celestron Zoom



    I bought a Celestron zoom because I heard some good things about it and for $50 dollars on amazon it seemed like a really good deal. However, I tried it out last night and I had problem achieving focus with it.

    Zoomed all the way out, I can achieve moderate focus, but things still aren't very sharp compared to my 25mm static piece. Zoomed all the way in (8mm which achieves 150X magnification) everything is quite blurry. I understand re-focusing is needed between different magnifications but even under the best focus I can get with 8mm the image is very poor.

    I'm wondering if I simply got what I paid for - a cheap and poor quality eyepiece, or if this is typical of zoom lenses? I know my scope is fine because the images through my 25mm look perfect, and a star test shows its collimated well. Perhaps I got a defective one? Or maybe the lens needs to be adjusted somehow?

    If you know anything about this eyepiece I'd like to hear your opinion/advice.

  2. #2
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    Default

    Hi Jovian ...I would try lifting it out of the focuser a little then use the set screw to hold it at that height ...I don't have one but it sounds like it may need an extension of some sort ...What kind of scope are you running ?
    16in Night sky
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    Default

    I'm using a good 'ole Orion XT8. The extension idea is a good one, I will try that out tonight and report back how it worked. If you have other suggestions though please share!


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    Default

    That is all i could think of ..It is strange because several people on here rave about zoom EP's ...You may just need one of those para focal rings They fit the barrell of the eyepiece and have a little set screw that you set so the EP dosent bottom out in the focuser ..
    16in Night sky
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    Default

    I tried this last night and it didn't do anything, and thinking about it more it seems to me this achieves the same thing as the focuser does, so it would only help if I needed to extend the EP further out then the focuser allows.

    Conditions were pretty good last night, very clear skys, no wind. I get pretty good focus at 24mm but at 8mm the quality is still terrible, stars look more like boxes then points of light. I think either the lenses aren't set properly or simply aren't shaped right, both of which are beyond my ability to correct. I'm just going to get my money back and invest in a static 8mm lens from a company I know produces quality goods. Thanks for your suggestion though.

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    Default

    Sorry i could not have been of more help ....
    16in Night sky
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    Default

    I have the Celestron zoom with a F4.5 10" Dob, at 8, it' almost impossible to get a sharp focus, at 24, not as bad, but not great. I just try to stay away from the limits and it seems fine. Of course, at 8, I am always using a barlow to try to look at Saturn or the Moon, and the sweet spot for focus is tiny.
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    Celestron 8-24mm zoom, Cheap 2x Barlow, Duct Tape, 5.5 sky in the front yard, a slight obsession, and an understanding wife.

 

 

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