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Hi Bruce
It depends whether you have a tracking mount or a basic camera tripod.
When I stopped down to f4 I had to increase iso to 1600 and time to 30sec.
As these shots were taken on a standard camera tripod without tracking, there was more noise and more stars were elongated.
Our EQ5 mount with dual motor drives arrives tomorrow, then I will be able to lengthen exposure time.
David
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