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I was just going by the math, not side by side test, as I've never directly compared a 5" APO to an 8" Cat. 5" APO = 20" squared, compared to 8" RC = ~50" squared - CO of 10" squared = 40" squared, so it has 200% the light gain capability, so if you are imaging you get the same amount of photons in half the time. It will have alot less contrast though because of the CO, and to be honest, I have no idea of wether this affects DSO imaging performance (I know contrast affects planetary performance alot)
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