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  1. #1
    arawk's Avatar
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    Default Interested in AstroPhotography



    Hello,

    Just perusing the net checking on techniques of shooting the sky/moon/planes. I have a Canon 550D with several lenses and have been inspired enough to go out and purchase a Celestron Nexstar 102 SLT with the required T ring adapter and 1.25" T adapter eyepiece to attach the camera.

    What I am still a little unclear on is whether or not it is possible to insert an eyepiece in-between the T ring and adapter to get even more magnification. I bought the scope two days ago and its been raining ever since so I have not been able to get out and play with it yet which may help me in answering my own questions as I learn better when I get my hands dirty.

    Any tips/tricks would be very much appreciated including pre and post production.

    Thanks in advance.

  2. #2
    sxinias's Avatar
    sxinias is offline Super Moderator
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    Default

    Welcome to the Astronomy Forum. Congratulations on your new telescope. Technically you can insert an eyepiece and get more magnification but you may not be very happy with the results. About the only objects that will benefit from using eyepiece projection are the planets and the moon. With planets, a simple web camera will do better than your DSLR.

    The NexStar 102SLT is on an azimuth mount. While it can track an object for hours, it can not adjust for the earth's rotation. This will limit you to about 20 second exposures.... not very long and your images will be dreadfully under exposed (have a very low signal to noise ratio). Inserting an eyepiece magnifies an image but makes it dimmer (lowers your already low signal to noise ratio even lower). This will only make your exposure problem worst. You really need to be thinking going the other way... using a focal reducer to make the image smaller but brighter (increases your signal to noise ratio).

    With your 102SLT and your DSLR you can photograph the brighter Deep Space Objects on the Messier and Caldwell lists. You will need to take a hundred or more 20 second exposures and stack the better ones (about half the exposures will not be usable). Programs like Deep Sky Stacker (freeware) make this task fairly easy. In the end you can make some very nice images like this one taken with equipment having capabilities similar to yours.
    SXINIAS

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    ZEQ25 mount;
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    SynScan AZ
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    Mount;

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    ST-80A 80mm Refractor (OTA); Meade
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    203mm SCT (OTA);
    Meade DS2090AT 90mm Refractor; Meade 2045LX3 102mm SCT;
    Celestron NexStar 4 SE 102mm MAK; Celestron Advanced Series C6S (XLT) 150mm SCT
    with an iOptron GOTO Drive

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  3. The Following User Says Thank You to sxinias For This Useful Post:

    arawk (05-24-2012)

  4. #3
    Maverick199's Avatar
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    Default

    Alternatively, you can piggyback your camera by installing a bracket on your scope which will perhaps allow you more exposure time as compared to prime focus. However, this depends entirely on your scope / mount set up.
    Z8.
    Telrad.
    "So many questions, so much to learn, so little time".

  5. #4
    arawk's Avatar
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    Default

    Thanks for the replys'.

    sxinias, do you have any models of webcams that you'd recommend? Would it mount to the scope the same way as the DSLR?
    Last edited by arawk; 05-24-2012 at 07:56 PM.

  6. #5
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    Default

    Welcome to the forum
    Degenerate Gambler
    Celestron Advanced Series C6-NGT
    Laser Collimator--Big Fan, yes you need one.



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  7. #6
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    Welcome to the group and the forum. Clear skies and good viewing! Congrats on the new scope.
    CHUCK WALTERS SCOPES: Celestron 1100 XLT; EdgeHD 800; Exp. Sci. ED80 APO; AR102; Orion 10" f/4 Astrograph; XT8 LE; Astro Tech AT72ED Coronado SolarMax II 60 BF15 MOUNTS: Celestron CGEM DX; CG-5GT; NexStar 6/8SE CAMERAS: JTW Ice Cube 650D BCF; JTW Ultimate 1100D v3; IS DBK21AU618; DMK21AU04 ZWO ASI120MC; ASI120MM SOFTWARE: StarTools 1.3; PixInsight; RegiStax 6; PHD; BYEOS; APT 2.0; FireCapture 2.2

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