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I was figuring that the sensitivity of the 9000 would be around double that of the 1600 on extended objects when you factor in the relative area of their pixels and the slightly better QE. I suppose that deserves some qualification though; In circumstances where the background signal is low (Narrowband for example) the 1600 will recoup some of the deficit by virtue of its better S/N ratio. (a function of its lower dark current)
A tough call really.
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