How can I improve my astrophotography?

I currently own an 8" Orion SkyQuest Dobsonian reflector. It has a focal length of 1200mm, and with it I have a 25mm Plossl and an 8mm Hyperion eyepiece. I also own a 2x barlow lens. The following image was taken with the 8mm eyepiece and 2x barlow (300x... show more I currently own an 8" Orion SkyQuest Dobsonian reflector. It has a focal length of 1200mm, and with it I have a 25mm Plossl and an 8mm Hyperion eyepiece. I also own a 2x barlow lens. The following image was taken with the 8mm eyepiece and 2x barlow (300x mag).

http://a6.sphotos.ak.fbcdn.net/hphotos-ak-ash4/310819_2082979122763_1493651911_31757719_1999863222_n.jpg

It was made from a ~20 second video of Jupiter using a Nikon Coolpix S3000 digital camera. The framerate of the camera is 30fps. The video of Jupiter was processed using Registax.

I'd like to state a few things. Since my telescope has a dobsonian mount and isn't motorized I have to improvise when taking pictures. What I do is once I get an image on the scope, I place my camera up to the eyepiece of the lens and start recording, and track the image as it moves along the field of view with my camera. Then I take the image and process it on registax. I am curious as to why my image doesn't look anything near as good quality as the following, taken with a 6" telescope.

http://www.youtube.com/watch?v=F84m6ETJyOU&feature=related

Should I change the settings on my camera? Longer exposure? I'm open for tips and suggestions.
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