The D3 allows me to shoot both to separate cards, so I do. It is also very reassuring having what is basically a negative available for the odd time I get things wrong in camera.
The other benefit of course is that I can do multiple exposures of the same RAW file when I need to show all the dynamic range, like the Bolton Abbey B&W pic posted recently - theres no way you could get that wide a tonal range in a jpeg.
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