ISO in the Sigma

Started Apr 21, 2013 | Discussions thread
Roland Karlsson Forum Pro • Posts: 26,394
Re: ISO in the Sigma

xpatUSA wrote:

jande9 wrote:

It was also shown in this forum a few months ago that changing the ISO setting in the camera does not affect the raw capture at all.  If you set the iris and shutter manually, you can put the ISO wherever you like.  The raw data doesn't change.  The ISO setting is just an instruction to SPP so it knows how to map the raw data to the densities in the final print.


Interesting reply

Even if untrue.

This has been discussed here before. It seems like the Merrill cameras do neither analog amplification nor use any A/D conversion bias. Changing the ISO only affects the exposure metering and sets a meta data. That's all.

This is just as the oldest Sigma camera does.

The SD15 and the DPNx cameras had a variable amplification, so the RAW data changed with ISO setting. Except for some claiming better higher ISO performance, it never got any enthusiastic response.

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