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ISO 50 - Reduced DR on original DP's

Started Aug 18, 2015 | Discussions thread
Roland Karlsson Forum Pro • Posts: 30,033
Re: ISO 50 - Reduced DR on original DP's

Scottelly wrote:

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

Yes, they have AFE. It is a rather unusual AFE though. It is a compromise between no AFE and the AFE all (almost all?) non Sigma cameras have.

For "normal" cameras AFE (plus digital amplification) will normalise the RAW data so that the RAW converter do not need to know anything about the AFE setting. But, Quattro does not amplify the signal proportional to chosen ISO, so you still need to know how to scale the data for correct exposure.

Brilliant (IMHO) but confusing.

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/Roland
Kalpanika X3F tools:
https://github.com/kalpanika/x3f

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