TREN
FujiFilm X-T100 read noise vs ISO
The FujiFilm X-T100 was measured at 19 ISO settings from ISO 200 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (200) read noise is 2.22 DN, or 2.7 electrons at the sensor. From ISO 640 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 18,751 electrons; unity gain is around ISO 240.
FujiFilm X-T100 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 200 | 2.219 | 1.15 |
| 250 | 2.657 | 1.41 |
| 320 | 3.272 | 1.71 |
| 400 | 3.945 | 1.98 |
| 500 | 4.724 | 2.24 |
| 640 | 5.816 | 2.54 |
| 800 | 7.210 | 2.85 |
| 1000 | 8.634 | 3.11 |
| 1250 | 10.778 | 3.43 |
| 1600 | 13.454 | 3.75 |
| 2000 | 16.336 | 4.03 |
| 2500 | 20.535 | 4.36 |
| 3200 | 25.634 | 4.68 |
| 4000 | 32.447 | 5.02 |
| 5000 | 39.671 | 5.31 |
| 6400 | 50.563 | 5.66 |
| 8000 | 62.683 | 5.97 |
| 10000 | 79.893 | 6.32 |
| 12800 | 101.829 | 6.67 |