Boris, combining replies.... It is something that I do hope to experiment with. However, while just trying something to see what happens does have value, I feel that I could do a much better experiment, and get a lot more out of it, if I understood the theory behind what I'm trying. If not, then some other factor might overwhelm what I think I'm testing, and mislead me to an inaccurate interpretation of my results.
On Apr 10, 2011, at 6:01 PM, David Parsons wrote: > Larry, > > Read through this, it may help your understanding (or it may confuse > the hell out of you): > > http://theory.uchicago.edu/~ejm/pix/20d/tests/noise/noise-p3.html#ETTR > > And the entire document: > > http://theory.uchicago.edu/~ejm/pix/20d/tests/noise/index.html > That's a very good document, I think I've seen it before. I re-read the section you pointed to, and am looking at the rest of it. It seems to touch on various of the things I asked about, but seems to primarily explore noise and SNR. Part of what led me down this trail of questioning was noticing that on green mode, my camera chose ISO 200 at f/11 rather than 100 at f/8 when photographing outdoors. I compared some photos with the exposure set by me, with the exposure set by the camera and realized that even at ISO 200 the camera's SNR was below the threshold where I could tell the difference between ISO 100 and ISO 200. Boris: this is something that I'd like to do some experimentation of as well. If the noise is below perceptible threshold up to some particular value, that means that there could be reasons to use high ISO other than insufficient light. I started thinking about the other ramifications of high ISO, and when I might want to use it, even if I have enough light to shoot at a lower ISO, and the contrast slope and dynamic range came to mind. I find it quite exciting to have a camera that doesn't feel like a temporary stopgap measure, but one that I plan on keeping long enough to make it worth learning all of the intricacies of it, rather than just enough to get by in tough lighting as I have for the past few years. -- Larry Colen [email protected] sent from i4est -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
