TREN
Phase One IQ180 read noise vs ISO
The Phase One IQ180 was measured at 6 ISO settings from ISO 100 to ISO 3200. Values were derived by Bill Claff from DxOMark lab data.
At base ISO (100) read noise is 16.56 DN. From ISO 100 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.
Phase One IQ180 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | 16.564 | 4.05 |
| 200 | 33.591 | 5.07 |
| 400 | 72.505 | 6.18 |
| 800 | 143.013 | 7.16 |
| 1600 | 418.766 | 8.71 |
| 3200 | 1,192.687 | 10.22 |