Nokia 9 vs Nokia Lumia 1020: read noise comparison

The Nokia 9 was measured at 17 ISO settings from ISO 100 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 2.58 DN, or 3.4 electrons at the sensor. Read noise keeps falling across the measured range, so the camera isn't fully ISO-invariant there. Settings above ISO 1600 don't change analog gain (digital push). Full well at base ISO is about 21,813 electrons; unity gain is around ISO 270.

The Nokia Lumia 1020 was measured at 5 ISO settings from ISO 100 to ISO 1600. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (100) read noise is 1.41 DN. Read noise keeps falling across the measured range, so the camera isn't fully ISO-invariant there.