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  1. #1
    maxsideburn's Avatar
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    Default Help with first astrophotography setup



    Ok here's the gear I've got at the moment:

    Celestron Astromaster 70AZ
    10mm & 20mm lenses
    Canon EOS T2i/550D
    Fotodiox t mount
    Celestron t adapter

    I tried briefly last night to get an image of the moon but had no luck. I would move the focus until it could go no further (toward the scope) and still could not focus.

    What am I doing wrong here? From everything I've read the t-mount and t-adapter should be all I need for imaging through this scope.



    Also I guess I'm just not getting how all of this works...the 10mm lens fits inside of the t-adapter and mounts to the camera just fine....but the 20mm seems to stick out of the back of the adapter too much, I'm afraid it hits my DSLR's mirror. Again something cannot be right here, as I'm certain I should be able to use a wider lens, the 10mm is too much.

    Any help is appreciated. Thanks!

  2. #2
    maxsideburn's Avatar
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    Default

    nevermind, took the telescope lens out of the adapter and it works great now.

    had to remove the telescope's "elbow" and mate it directly to the scope. kinda hard to describe...but I pictured a telescope lens in the t-adapter and mounted in a vertical position on the telescope, now it's got no telescope lens and is just mounted straight through the scope.

  3. #3
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    Default

    It's called prime focus - no EP - removing the diagonal allows you to get the camera into prime focus. the lightpath would be too long otherwise.
    Now you can take photos - try not getting too long exposures (30 seconds) - AZ mounts aren't good at tracking for long periods accurately
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  4. #4
    maxsideburn's Avatar
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    Default

    yeah, my poor little telescope had a hard time keeping still enough to photograph the moon. will try again tomorrow night though when I have more time to fool around.

    was rushing tonight.

  5. #5
    maxsideburn's Avatar
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    Default

    just curious though....since I can't use any lenses with my setup how am I supposed to change the magnification? lol

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    Default

    Quote Originally Posted by maxsideburn View Post
    just curious though....since I can't use any lenses with my setup how am I supposed to change the magnification? lol

    The moon is the only thing you will want to change magnification on. Use a barlow.
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  7. #7
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    Default

    As said , a Barlow with a T thread mounted to the camera wil do the job for you .

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  8. #8
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    Default

    well since you have a DSLR dont hink of your telescope as a telescope just think of it as a really long prime telephoto lens. Adding a barlow would be like those wide field or 2x telephoto adapters you can get for DSLR lens (the darkening effect will probably be similar as well)

  9. #9
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    Default

    ah ok...

    in that case let me ask this question. if I intend to buy another scope in the future with more "zoom" what specification on the telescope would tell me that information?
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