"Base ISO" for Sigma DP2M (and others)

Started May 17, 2014 | Questions thread
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"Base ISO" for Sigma DP2M (and others)
May 17, 2014

I have read that the base ISO is 200, meaning that setting then ISO at 100 is equivalent to using a neutral density 1-stop filter, which one would only do if a slower shutter speed were desired.

First of all, is this true, and how do we know?

Second, is this what owners use as their basic good-light setting, 200?

Third, can someone tell me what the base ISO for my DP1s is, given that it allows a setting of 50 for the lowest ISO?

And finally, has anyone succeeded in seeing for themselves that the noise content of images taken at ISO 200 on the DP2M is as low as it gets?

This question has not been answered yet.
Sigma DP1s Sigma DP2 Merrill
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