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ISO 50 - Reduced DR on original DP's

Started Aug 18, 2015 | Discussions thread
Scottelly
Scottelly Forum Pro • Posts: 18,028
Re: ISO 50 - Reduced DR on original DP's

PrebenR wrote:

Kendall Helmstetter Gelner wrote:

SRT201 wrote:

Interesting. So there's no gain on the imager and it's all just a matter of underexposure and multiplication during the development stage.

In that case then the ISO 50 with -1 compensation should be identical to ISO 100's normal exposure. Correct? Fairly easy to test.

"In theory there is no difference between theory and practice. In practice there is."

- Yogi Berra

Are the Quattro's ISO-less as well?

All of the Sigma cameras are.

That said, when using SPP to actually process the raw files they do not behave as if they were ISO-less.

You should test and see what happens (especially in the shadows), but I agree with the statement that you lose about a stop of highlight recovery.

I thought the Quattros had AFE. If it is only in SPP, then it would be interesting to hack the RAW images of the Quattros to change ISO. Roland, any pointers?

The Quattros DO have AFEs.

If they didn't, this wouldn't happen:

http://sigmadp2quattro.blogspot.fr/2014/07/gestion-de-bruit-electronique-campare.html

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