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I did see that thread, just looking at the Horsehead image the amount of data captured in the 45 second subs (Despite the tilt issue) compares with 5 minute subs I have taken with the ED72, which is what you might expect, about 1 minute at F2 being more or less equivalent to 5 minutes at F4.9.
It does not make my choices any easier! But it would be great to be able to go as deep as I am now with under 2 minute subs and for really faint stuff maybe even run to 5 min subs to see what is there.
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