Quote:
Originally Posted by Shiraz
There are two major advantages to the ICX694:
1. it has 65%QE at Ha, which makes it more than twice as sensitive as many other CCDs - you can use under half the sub length (and total exposure time) for the same detected signal,
2. it has about half the read noise cf many other CCDs, so you can take 4 times as many subs for the same contribution of read noise to the SNR (read noise adds in quadrature).
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Certainly more than twice as sensitive as my ICX274...
I think I'll try doing more-shorter subs rather than fewer-longer subs and look at the difference....