Most of the Sigma Camera Model's raw data, especially pre-Merrill, can exceed the theoretical ADC max value of 4095 by a lot - but without indicating any sensor saturation. For example, the SD14 is quite OK at values around 6,700 and indeed various numbers in the meta-data show nothing wrong with that.

So Sigma clearly does something to the ADC data before writing it as "raw" to the X3F file. That doesn't bother me too much - after all, the saturation level is easy enough to estimate from a simple over-exposed image.

But one irritating oddity to me is the DP2s compact model.

According to RawDigger, this camera saturates at about 2,400 - much less than the theoretical 4,095. As far as know the camera has 12-bit ADCs and, unlike other Sigmas (SD15, DP2x,Quattro), it has no AFE.

I always shoot at ISO 100, FWIW. RD black level is manual 0.

In this post I am seeking confirmation that, for the Sigma DP2s, RawDigger is displaying the X3F raw data as written to the camera's memory card with no additional scaling done by RawDigger.

best regards,

Ted