TREN
FujiFilm X100VI read noise vs ISO
The FujiFilm X100VI was measured at 26 ISO settings from ISO 64 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (125) read noise is 1.61 DN, or 2.5 electrons at the sensor. From ISO 2500 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 12800 don't change analog gain (digital push). Full well at base ISO is about 24,053 electrons; unity gain is around ISO 200.
FujiFilm X100VI read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 64 | ○ 1.625 | 0.70 |
| 80 | ○ 1.959 | 0.97 |
| 100 | ○ 2.346 | 1.23 |
| 125 | 1.613 | 0.69 |
| 160 | 1.972 | 0.98 |
| 200 | 2.362 | 1.24 |
| 250 | 2.789 | 1.48 |
| 320 | 3.531 | 1.82 |
| 400 | 4.408 | 2.14 |
| 500 | 3.074 | 1.62 |
| 640 | 3.891 | 1.96 |
| 800 | 4.925 | 2.30 |
| 1000 | 5.776 | 2.53 |
| 1250 | 7.413 | 2.89 |
| 1600 | 9.448 | 3.24 |
| 2000 | 11.472 | 3.52 |
| 2500 | 14.026 | 3.81 |
| 3200 | 16.450 | 4.04 |
| 4000 | 20.678 | 4.37 |
| 5000 | 26.723 | 4.74 |
| 6400 | 33.359 | 5.06 |
| 8000 | 41.643 | 5.38 |
| 10000 | 53.076 | 5.73 |
| 12800 | 60.969 | 5.93 |
| 25600 | ▼ 62.250 | 5.96 |
| 51200 | ▼ 61.393 | 5.94 |