On Thursday, January 30, 2003, at 04:19 AM, Craig Zendel wrote:
I guess I'll have to do some tests, but observations, so far, would suggestI didn't answer previously because I didn't know which method produced a less noisy file, the push or the higher ISO, and my guess is that they produce about the same amount of noise and very similar file overall.
that underexposing and then "pushing" in RIC increases contrast (same as
film) BUT has little or no effect on noise (unlike film grain).
So given a low contrast subject, a "one stop push" (sound familiar?) may
produce a better file?
But your first comment above, that noise does not increase with a push, is definitely counter to my experience. Like I said, I am betting that the two methods produce parity, but one may have the advantage over the other. However both will add a bunch of noise. Either stepping up to iso 200 or a one stop push is barely noticable in terms of noise, but iso 400 and a 2 stop push should be pretty noticable, though not horrible (not much different than iso 400 slide film...though I have not used provia 400F)
Mike
Michael J. Shupe
M.J.Shupe Photography, Streetcar Station
Michigain Tech University
www.northernlightsgallery.com
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