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  1. #1
    toolmaker's Avatar
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    Default Saturn with a DSLR - April 13th 2012



    I haven't posted anything in awhile, I hope everybody is doing well.

    Last night/morning we had some pretty good seeing so I decided to try my luck with planetary imaging with a DSLR. I started off with Mars but the videos we coming out overexposed and I couldn't lower the shutter speed, everything just looked like a blurry mess.

    I had much better luck with Saturn, this is the processed image from a stack of 794 frames out of a total of 3967 frames captured (20%).

    Captured using EOS Movie Recorder at 22 fps on a 11" EdgeHD @ f/25. Aligned and stacked in Registax (Im a complete noob with this program, if anyone has any advice on how to get good results with this software please let me know, I left everything on default but changed the limit to 20%). Processed in PixInsight, there was some colour fringe due to the barlow (I presume) so I had to manually align the individual colour channels and then recombine them into a new image before processing.

    I'm pretty happy with the result, please let me know what you guys think (too much colour saturation?).
    Dave
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  3. #2
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    Default

    That's great.. one question.. what do you mean by f25? How do you adjust the fstop.. are you shooting through the eyepeice...and a lens ?
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  5. #3
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    Quote Originally Posted by fogfire View Post
    That's great.. one question.. what do you mean by f25? How do you adjust the fstop.. are you shooting through the eyepeice...and a lens ?
    Thanks Ken, I was shooting through a 2.5x barlow so the scopes native f/10 was increased to f/25
    Dave
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    Default

    I just processed another video from a little earlier in the night, this one seems a bit sharper but I'm not too sure about the colour. Let me know what you think.
    Dave
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    Default

    Great shot! Shows how good DSLR's are today in proper hands.
    Z8.
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    Default

    Excellent photos mate!
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    Default

    Very nice! How big was the video data file? Small CCD color videocam recordings like this are 1GB+. Your method may work well imaging the whole moon with the large DLSR CCD and larger SCTs.
    Paul

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    Quote Originally Posted by pbenni View Post
    Very nice! How big was the video data file? Small CCD color videocam recordings like this are 1GB+. Your method may work well imaging the whole moon with the large DLSR CCD and larger SCTs.
    Paul
    The video size depends on which capturing software I use. The above images captured with EOS Movie Recorder were initially 900MB for 3min of video at 22fps. Not bad IMO, but there is clearly some video compression going on.

    If I use Backyard EOS there seems to be little to no compression used (theoretically better for image quality) and the resulting videos are much larger. For a 105s video the resulting size is 1.8GB at 22fps.

    I haven't been able to determine if the increased bitrate employed by BYEOS pays off in better quality final images, so for the moment I continue to have a slight preference for EOS Movie Recorder and the smaller file sizes it produces.
    Dave
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    Thats just an amazing image.
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    very nice capture and you have lots of detail,
    am gona give it a try tonight see if i get the same results..
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