I'm going to amplify on this basic principle with a few demonstration shots. (Howard, do not criticise these images on the basis that they are processed for exhibition).
The dynamic range of DSLRs has been increased by the concept of ETTR (expose to the right). The DR of current DSLRs is now roughly equivalent that of to color film, but not as great as the best B&W film.
From previous comments, I know BJL thinks the DR of current DSLRs is sufficient.
The following images will show that it's not sufficient.
Whilst trekking recently in Nepal, I took a few shots to demonstrate the tremendous (monetary) value of accommodation, even though it was very poor by western standards. The following shots of hotel accommodation in the middle of the Nepalese hinterland, demonstrate the value you get for $6 a night with ensuite.
I tried to capture the 'room with a view' concept in the following shots.
Of course the DR of my 5D was not up to the task, as can be seen in the following shot.
[attachment=1940:attachment]
So what happens if I try my best to bring out the shadow detail?
[attachment=1941:attachment]
Well, clearly, that's an absolutely hopless shot. Nothing there that's interesting.
Supposing I take a shot that's right for the room.
[attachment=1942:attachment]
As you can see, I've lost the view.
Okay, so I blend 2 different exposures (as it so happens the differnece between an ISO 1600 exposure and an ISO 100 exposure.)
This is what I get.
[attachment=1943:attachment]
Whilst we're on the subject, here's the view from the ensuite. Blended images of course, but not a perfect blend. This would need some work before exhibition.
[attachment=1944:attachment]
Notice what a meticulously tidy person I am .