I don't know why it works from a technical point of view, but it  
works:-). The K20D yields very good high ISO pics with noise control  
set to the minimum. If I get the results I want, I don't worry a lot  
about why I got them.
Paul
Paul
On Jun 29, 2008, at 4:57 PM, Toralf Lund wrote:

> Paul Stenquist wrote:
>> In truth, the K20D is an excellent high ISO performer, [ ... ]
> I've been meaning to ask some questions about this for a long time,
> since it doesn't really make sense to me when people say that a  
> certain
> camera is has a good high ISO performance. I mean, doesn't the ISO
> setting just multiply the signal? Shouldn't that mean that the
> performance is exactly as good, relatively speaking, at high ISO  
> values
> as it is at low ones (and vice versa)? Or is what people really mean
> that the noise under low-light conditions is better controlled
> (regardless of the ISO setting as such)? Or does the sensor actually
> have an improved dynamic range that doesn't show up at lower ISOs
> because the A/D cuts of part of the signal? Is this what "extended
> dynamic range" is all about? Or, alternatively, is everyone merely
> talking about the quality of the built-in image enhancement  
> software (in
> which case I'm not really interested..)?
>
> Just thought I might mention it, since the subject was brought up yet
> again...
>
> - Toralf
>
>
>
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