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adding on to what Raymo has mentioned, only the brightest stars will show up in liveview. you may need to take short exposures to help frame your shots. your scope is quite slow (f/10) for deep sky photography, so adding a tele extender will make it even slower (and therefore harder to see). i'm not familiar with SCT's you may need a extension tube to reach focus at prime focus (t-ring and t-mount) or you might not, that happens a bit on some Newtonians.
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