Thanks all
Heres a preview of the 600D
I use
AVS Video Converter to convert the .MOV to .AVI files
Its easy to use and has a great variety of conversion options, and can also edit video files.
Yes its odd canon used 640x480 only for full res. crop in the 550D but 1080P in the 600D. Ideally canon should have both options, but the 1080 crop is great not only for astronomy work but turns a 50mm lens into a 150mm telephoto.
This was shot with the video zoom and a 50mm lens.
Scott