Hi Tom,
Welcome
I haven't been here long myself, but I hope the below helps somehow. Sounds like you're chasing the "Liveview" function:
http://support-th.canon-asia.com/con...0228500.html#1
Liveview is a great opportunity to check focus. You can do this by digitally zooming in with the liveview screen. Get a star in the LCD, zoom in digitally, then adjust the Scope's focus carefully until this star image is sharp. Exposure is another aspect you can pay attention to, at this stage. After that, you're good to go.
Post results in the Beginners astrophotography section!
Party on!
Andy.