My problem with answering this question is that I don't understand all I know about it. I use Nikon DSLRs everyday for work and have for several years. The exposure readings for digital are not the same for film.
Here's what I've noticed: The digital is not responding and recording the extreme brights the way film does. When I think exposure in graph form, there's a nice straight line as we move from the lows to the mids. Once we get to a situation where highlights are introduced there's a slght upward curve-- I have to close the lens down a few more stops than if I were using film. Maybe it's just the Nikons, I don't know. However, it's been consistant over several generations of the technology. When shooting in bright light, I tend to think of shooting chrome film.
Another thing to keep in mind: all of these pro digital cameras have adjustable viewing screens, so take that into account.
On the other hand, I may be way off. It's been known to happen.
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