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will this camera be suitable for astrophotography
Last post 05-05-2008 07:42 PM by tkerr. 2 replies.
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  • 05-05-2008 08:28 AM

    • robr
    • Joined on 04-23-2008
    • Posts 21

    will this camera be suitable for astrophotography

    Good Morning

    I have just received a Canon PowerShot SD890 IS elph from a contest at work.  I have recently purchased and not have received it yet (est ship date 5/9).  I have purchased a Zhumell 10" dob.  I just want to know if this camera will be sufficient and what i would need to do to rig it to my telescope.

     give any advice

  • 05-05-2008 10:13 AM In reply to

    Re: will this camera be suitable for astrophotography

    Well, No ... and Yes.

    You won't be able to attach it to a telescope and make long-exposure images of distant galaxies and similar dim objects, for example.

    But you can:

    • Put it in Movie mode and hold it over the eyepiece of a telescope and move it until you're focused on the object in the eyepiece, then later extract the sharpest few frames from the movie (using a freeware program called VirtualDub, for example). You can image bright objects like the Moon, Saturn, Jupiter, and Venus, for example.
    • Put it in a bracket that holds it stably over the eyepiece, aim the telescope at the Moon, and make very detailed images of the lunar surface. This takes a little practice, but can produce very good results.
    • As above, you can mount the camera over an eyepiece and make a movie of the Moon, then use free software like Registax to select the best frames from the movie and post-process them into a single, much-improved image.

    The above methods are called afocal astrophotography and it's a good way to get started -- especially since you already have the camera. A good afocal bracket is available at Scopestuff, among other places. They look like this:

    Another way to use the camera:

    • Put it on a photo tripod and make 15-second exposures at ISO 1600 of constellations. You can make 50 or 60 such exposures and then stack them together using free software like Registax or DeepSky Stacker. This works best under a dark and clear sky. You're limited to 15 seconds for a single exposure with that camera, but that's long enough to capture the brighter constellations like Orion, and short enough to avoid star trailing.
    Signature
    Visit my Flickr! astrophoto album at: http://www.flickr.com/photos/chipdatajeffb/ and our Three Rivers Foundation for the Arts & Sciences website: www.3rf.org.
  • 05-05-2008 07:42 PM In reply to

    • tkerr
    • Joined on 01-02-2004
    • Coastal North Carolina USA.
    • Posts 8,699

    Re: will this camera be suitable for astrophotography

    You can find my somewhat lengthy reply to your questions in the following link.  This should answer more questions than just those you have asked here. Hope it helps.
    http://cs.astronomy.com/asycs/forums/t/19319.aspx

     

    Have A Nice ___________

    Signature
    Have A Nice __________
    Tim Kerr
    Healthy mind - healthy body - healthy earth.
    Ad astra
    Ad eundum quo nemo ante iit
    Jacksonville, NC.

    Equipment:
    Orion XT10 Classic, Celestron C6 R-GT w/updated CG5 GT mount, C80ED
    Canon EOS 350D, Meade DSI II Color CCD, Phillips SPC900NC WebCam
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