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Hi Carlton,
If you can see planets, use them initially to get your focus while you're learning your setup. They are far enough away to be considered at infinite focus. If you can't get a really clean focus on the planets then maybe it is to do with back focus etc. as has been mentioned. Once you have planets in focus, slew to a bright star and see how it looks.
I might do a mini hijack here because my question might help you too.
I don't have live view on my 5d but I see it mentioned a lot. I take exposures then review them when focusing. So my question is, isn't live veiw the camera holding the mirror up, then taking multiple exposures in the same way a video camera works ? If that is the case and it has a reasonable refresh rate, you would only be able to see the absolute brightest stars. When I'm setting up, if I've forgotten to switch to bulb and I take a very short exposure, I generally get very little on my screen. Is this how it works ?
Again I apologise for the mini hijack
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