Hi david,
you can use your existing 600D on video mode, you won't have to buy anything else then. often people will buy something like a televue powermate or barlow to 'zoom' in more on the target, otherwise you can go to 3x optical zoom when recording and the image doesn't degrade. record in RAW format.
i think you will need to convert the file type afterwards, but the software that came with the camera is able to do that.
cheers,
russ
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