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Andy, on my 550d if I can't see any stars using live view, it's usually because I've left the camera settings on daylight exposures. e.g. 125th of a second, f 8, 200 iso or something like that. So I just change the settings to bulb or 30 seconds at 3200 ISO and the bright stars appear ready to focus. So in answer to your question, you can change the gain in live view and see the effect it will make on the screen by revealing the brightest stars that were previously not visible before the change.
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