Originally posted by ivanp I think it is misunderstanding. The guy in video does not claim that EDR leads to higher noise, but that with activated EDR "the minimum ISO is increased to 200 and it may give more noise in shadow details".
As I understand it, you can either
compare apples to apples = pictures with ISO 200+EDR OFF and ISO 200+EDR ON (and the noise will be the same),
or compare apples to oranges = pictures with ISO 100+EDR OFF and ISO 200+EDR ON (and the noise will be different, but not because of EDR, but because using different ISO speeds).
ivanp's observation is a good one. I'm not sure he's right, but it's something I hadn't thought of. Perhaps EDR increases noise simply because it boosts the ISO by one stop.
But gosh, there HAS to be more to it than that, no? I mean, there's got to be something going on besides the elimination of ISO 100. And if EDR does (a) cause the shot to be somewhat underexposed so that (b) the camera can then pull up the shadows, well, then I'd expect an increase in noise. AT least that's always the case when I post-process shots on the computer. Pulling detail out of underexposed shadows always results in more noise than I'd have gotten if I'd exposed those details right in the first place.
By the way, I'm having trouble understanding why EDR eliminates ISO 100. I
think what has been said here is that, if you set your ISO at (say) 200, the K20D actually exposes the shot at ISO 100 and then does some in-camera boosting of the signal (if that's the right term) by one stop. Is that about right? But does that in itself reduce clipping?
Will