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Cr@p, Im glad I asked such a simple question!!!!
I assumed but did not state I would be using the same camera.
Essentially the image scale is the same for each scope, with the 12" F8 having a slightly larger obstruction than the 10" f10; which still makes the 12" gather more photons for the same length of exposure as its the bigger bucket. Very roughly a 10 min sub with the 12" would be equivalent to a 15 min sub with the 10" scope.
Think Ive got a handle on it now but very interesting all the same and thanks to all who replied.
Allan
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