From: Eric Weir
On Dec 2, 2010, at 8:24 PM, Godfrey DiGiorgi wrote:
Another resource that comes to mind is to drop by a used
bookstore and hunt up a copy of the old classic "Basic
Photography" published by Focal Press in the 1960s. Invaluable
information at whatever level of depth you can tolerate.
I picked up a copy of a book on the zone system by Minor White from
the '40s at Wings [used cameras and stuff] that I skim while eating
breakfast. Greek to me at this point. Main question right now: What's
the point of previsualization if in the end you've got one focus, one
aperture, one shutter speed, one ISO? I can see compensating to bring
out detail in one area of the scene or to avoid overexposure in
another, but not more than that.
I think previsualization is kind of like my grand-daddy always said
about "measure twice - cut once". It's sort of an additional step to get
your mind in sync with what you're trying to accomplish.
You don't always have just one focus, one aperture, one shutter speed.
When you change the focus, aperture & shutter speed in an inter-related
manner you change your image. You could have a dozen different focuses,
each with it's own appropriate aperture and shutter speed.
Previsualization helps you "see" how changing these factors is going to
change the final image before you commit to film (or sensor).
--
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