Quote Originally Posted by MattKing View Post
And for clarity, I find it really important to understand one thing about reciprocity failure.

Although we often speak about the effect in terms of exposure times, the sort of low light corrections we are talking about here are not caused by the long exposures - they are caused by the extremely low light levels.
I don't doubt your correctness but can't get my head around your statement... Don't know how you can have one without the other (unless for instance you are saying there isn't a significant difference between an intentional 10 stops overexposed 2 minutes exposure compared to a 10 stops overexposed but 1/10th second shot)...