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Since this post went up, i've been digging around where I saw some figures. I'm not sure if it was on Christian Buill's site (I can't find it there now), but for the various recent flavours of Canon, there was a table with the optimal ISO for each. I know that for the 350D, it was 800.
I thought I may have found reference to this table here on IIS, but again, my searching has come up empty.
The figures were derived in a very scientific manner IIRC, based on the chip sensitivity and amplification characteristics. Sorry I can't find reference to it.
Turbo
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