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Boy, this certainly got a bit of attention and I feel I should explain why I asked my question.
I use a QSI583WSG camera for imaging and currently have a 10" GSO RC f8 and a Meade 10" f10 SCT. I'm thinking of upgrading the 10" GSO RC to the truss version of a 12" CSO RC f8 to gain a little more light and hopefully increase the signal to noise ratio of my imaging so that I can get a bit more of the faint detail in my galaxies.
From my calculations the 10" SCT and the 12" GSO RC have almost the same image size at 0.45 and 0.46 arc sec/pixel, respectively. Thus it would come down to the extra light gathering capability of the 12" over that of the 10" to put photons into each pixel.
My question was, under these circumstances, how much longer would I have to expose with the 10" scope to get an equivalent sub as that from the 12" scope?
Of course I'm assuming that a 15 minute exposure through the 12" scope will lift the signal from the background noise more than the 10" scope would and thus make processing a little easier to pick up faint detail.
Allan
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