Geoff, I used an old analog video camera to capture afocal images of Jup and Saturn with my 10"Dob.
To capture it to your computer you need an av capture device, Belkin makes a very good one but there are cheaper versions you can buy off ebay.
You can then run the .avi's through Registax to get your final image.
It's amazing what you can come up with after a bit of practice.
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