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Hi Alan, thats a big question.
That depends on what astrophotography you wish to attempt. Planetary, DSO, lunar, widefeild and what equipment you have to make it all happen.
Do you have a tracking mount ?
I'd suggest starting with widefield just using the camera and existing lenses to discover some of the techniques and pitfalls and then progres from there.
I've been working towards astrophotography for nearly two years now and I am just starting to come to grips with some of the issues involved.
Maybe if you tell us a little more about what hardware etc you have, your astronomical experience and what you want to acheive then better advice can be given.
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