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The 6303 would be a really good match for your big scope - would seem to be a good value swap for galaxy/NB imaging if you can deal with the blooming. Not sure it would be any better than your 16803 though, except for Ha imaging.
the 694 is not very well matched to your CDK, being better suited to ~1m fl scopes. You need not be concerned about the well depth though, since the 694 actually has more dynamic range than the 6303 when multiple subs are allowed. For example, adding 9x5 minute subs with the 694 will produce the same read noise power and signal as 1x45 minute sub with the 6303. The 9 subs with the 694 will allow 180,000 electrons before saturation, which is much higher than the 100,000 allowed in the 6303, so the 694 is the better chip for dynamic range. You just need to forget the old way of thinking and accept that short subs can be effective when you have low read noise. And of course don't forget that the 694 will be twice as fast as a 6303 with O3 NB data - it has way better QE at short wavelengths. It would be a very effective chip for your shorter focal length scopes.
regards ray
Last edited by Shiraz; 12-10-2013 at 08:01 PM.
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