Originally Posted by
Diane Miller
Amazing!! I love the starbursts -- I assume they're from the telescope structure (not sure what it is called). Looks like there is another very small (well, very distant) galaxy almost behind a star near the lower left.
My astrophotography buddy has an Atlas and I'm thinking about a Sirius. I assume you need autoguiding at those exposure times. How long can you expose without guiding -- or are there too many factors that affect the number? I'd rather do what I can without guiding before I think about getting into it.
What would be the equivalent focal length here (including any crop)?