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I find the 2X is working fine for me,, it is something I pay attention to as it can go South fast if your not,,
on my D300 I never gave it much concern but the 800E requires it,,
First camera where I am frequently using Auto ISO. Like a hot mistress, the D800 can do incredible things but can bite you in the ass if you don't pay attention to her. Actually, I was kind of surprised as I had a Canon 7D with a similar pixel size / density and never gave it a thought. For whatever reason the D800 is more demanding of good technique.