I just realised I didn't answer your question re computer capture. Yes, I do use a low cost PCI video capture card at 768x576 resolution. There's a picture of it on P.69 of the Video Astronomy book. Cost about $95. I'm still seeking out a low cost USB solution that offers the same resolution as interfaces like the Belkin composite to USB converter cables offer only up to 640 x 480 that I know of to-date at least.
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