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Gee, thanks Guys, its good to be back ;-).
Chris. Yes, 3nm at f9 is a pain, I was at f6 before and 20min subs were fine. I could go to 1hr subs, but its getting silly. One bad sub is an hr lost.
7nm would allow a bit shorter times, but then more other light gets in and that colour isnt as deep. Also, ive got an NII filter. Ha and NII are so close, 3nm is needed to seperate them.
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