Yes I'm learning that seeing conditions are very important. Starting to get cooler weather here now, and more clouds and dew. Sounds like the Live view at 5x zoom would be the best way to go for the 600D. I'm going to get a 60D and try the crop mode just to see if it makes any difference. Ideally I'd like a setup like yours, with tracking mount and dedicated planetary camera, but that might have to wait a while. In the meantime I'll just have to use what I've got. Here's my current best (or close to best) saturn and jupiter taken with the 600D using the 3x digital zoom:
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