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Hmmm, OK, so some 120 sec subs at ISO 800 and LOTS of them is a betterchoicethen.Cheers, I might go dig out the 2 min subs and give them a go.
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It still depends on the sky condition.These articles are very good and speak to some of your questions.
http://www.pbase.com/samirkharusi/beginners
http://www.iceinspace.com.au/forum/s...00&postcount=1
http://www.samirkharusi.net/filters.html