Kodak DCS Pro SLRn read noise vs ISO

The Kodak DCS Pro SLRn was measured at 15 ISO settings from ISO 6 to ISO 1600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (160) read noise is 3.05 DN, or 33.4 electrons at the sensor. Read noise keeps falling across the measured range, so the camera isn't fully ISO-invariant there. Full well at base ISO is about 44,804 electrons; unity gain is around ISO 1740.