Why? Because the images are far better
Especially in the shadows. Here can you see film response curve -
http://www.covingtoninnovations.com/dslr/crvFilm.gif
Now, when you shoot in the ordinary way, the shadows will be in the "toe" (nonlinear) area of the curve. They are still there, but not as rich as you will expect. So, if you will give two more stop in exposure, shadows will go upper in the curve. Clearly all of the tones will go upper, so you must adjust (reduce) the developement. (by the artificial light, where the contrast is offten low I keep normal developement times) The negatives are maybe little bit darker, so you will need to add more light under the enlarger, but this is a reasonable price for the results... Try it. (ideally "by the water edge" in deep forest, i trust you will be amazed) And why to use this procedure by portraiture, when the face is in zone 6 or so? I trust, that it will bring more beautifull skin tones. Ad when the subject has black hair, why do not have very rich detail in every sepatated hair?
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