Testing my GH2's sensor

Started Feb 20, 2011 | Discussions thread
_vlad
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Re: Testing my GH2's sensor
In reply to bg2b, Feb 22, 2011

But if you're backed into a corner and think you need f/2, 1/100, ISO 3200, and as much dynamic range as you can get, and if you have time to set everything up, then theoretically you're better off shooting at f/2, 1/100, ISO 800, and then pushing it two stops in the RAW converter. You'll get two more stops of DR for highlight recovery, while your shadows will be no noiser than if you had used ISO 3200 in-camera .

All might be true if the camera makes no changes to original RAW file. However do we know for sure that RAWs are really left intact with just signal linearly amplified? I know for sure that Pentax K20 when using spec. mode "Dynamic range ON" not only influenced JPEGs (as paralell output to RAW) but used a different curve (more gentle in highlights area -or in another words different amplification of a signal for different light levels) which in final result give even higher DR as a result (not in terms of absolute DR of sensor but absolute capturable DR of a scene). If e.g. GH2 is using something similar then max. possible DR of a scene might be higher by using standard camera settings compared to manual (i.e. linear) push in RAW converter. With latter you can not do nothing if the highlights are blown however former will squeeze the DR range of a scene to more capturable range.
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Vlad

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