DXOMark results for GH3

Started Feb 14, 2013 | Discussions thread
Pixnat2 Veteran Member • Posts: 4,757
Re: GH3 ISO 6400, 12800 and 25600 = ISO 4832 ?

Anders W wrote:

Pixnat2 wrote:

SHood wrote:

No big surprise with the same score as the E-M5. Only difference is the measured ISO on the GH3 is closer to actual ISO vs the E-M5. Also ISO125 seems to be base ISO as all results improve at this ISO.



I wonder about those differences between the GH3 and OM-D :

GH3 : max measured ISO : 4832

OM-D : max measured ISO : 11848

Both labelled ISO 25600.

Moreover, the labelled GH3 ISO 6400, 12800 and 25600 are all measured at ISO 4832.

Could someone explain it? What does it mean? If they have the same sensor, why those differences?

P.S. Sorry i it was already discussed but I've missed it.

The highest "real ISO" of the GH3 is 6400. The RAW data values recorded at ISOs above 6400 are exactly the same as those recorded at 6400. There is neither more analog gain applied, nor any digital scaling of the RAW data values above that point. The only difference is that the camera embeds a different instruction ("exposure tag") to the RAW converter about how much it should push the exposure by default when the file is opened.

Thank you Anders!

But it does mean that the highest "real ISO" of the OM-D is 25600 (measured 11848)? Or am I wrong?

Does it means that Olympus choose to add analog gain until ISO 25600 (11848) and Panasonic stop it at ISO 6400 (4832)?

I'm interesed in your (and others) opinion about the difference between both camera that apparently sport the same sensor?

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