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I don't know what focal length scope you are using, but your max length
subs would be typical for a 1000mm f/l scope. Assuming you are using a
scope of that length, you won't get much more than 120secs with more
accurate PA, but you will of course get more consistency. I have when
experimenting achieved an occasional 150sec. Any longer than your
120secs you will have to guide.
raymo
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