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Hi Fred,
Here are my numbers:
The qe values I get for H-Alpha (656nm) for those sensors is:
KAF-3200ME = 0.80
KAF-6303E = 0.65
KAI-11002 = 0.30
KAF-16803 = 0.45
Also because narrowband darkens the sky so much, sensor noise is also going become a factor and the values for those (I use values I have seen measured - not those spec'd by Kodak).
KAF-3200 = 11 e-
KAF-6303 = 15 e-
KAI-11002 = 16 e-
KAF-16803 = 7 e-
The areas of the sensors are:
KAF-3200 = 152 mm2 (equivalent to 267 mm2 when focal reducer used to match pixel scale to other chips)
KAF-6303 = 511 mm2
KAI-11002 = 878 mm2
KAF-16803 = 1380 mm2
Assumming minimal vignetting problems with the larger sensors then I would calculate equivalent exposures as follows for the same area of sky:
KAF-3200 = 4.6 Hours
KAF-6303 = 2.9 Hours
KAI-11002 = 3.7 Hours
KAF-16803 = 1 Hour
I'd still be looking at the 16803 chip but whether the scope is going to cover it well is something you would need to research. Anyway good luck with your decision.
Terry
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