TREN
FujiFilm X-H2S (ES) read noise vs ISO
The FujiFilm X-H2S (ES) was measured at 20 ISO settings from ISO 160 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (160) read noise is 3.89 DN. A second gain (dual gain) kicks in at ISO 500, cutting input-referred read noise by about 1.2 stop. From ISO 2500 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.
FujiFilm X-H2S (ES) read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 160 | 3.891 | 1.96 |
| 200 | 4.438 | 2.15 |
| 250 | 5.028 | 2.33 |
| 320 | 5.979 | 2.58 |
| 400 | 7.260 | 2.86 |
| 500 | 4.084 | 2.03 |
| 640 | 4.691 | 2.23 |
| 800 | 5.426 | 2.44 |
| 1000 | 6.409 | 2.68 |
| 1250 | 7.674 | 2.94 |
| 1600 | 9.126 | 3.19 |
| 2000 | 11.004 | 3.46 |
| 2500 | 12.996 | 3.70 |
| 3200 | 16.223 | 4.02 |
| 4000 | 20.252 | 4.34 |
| 5000 | 25.281 | 4.66 |
| 6400 | 30.696 | 4.94 |
| 8000 | 35.753 | 5.16 |
| 10000 | 45.887 | 5.52 |
| 12800 | 58.485 | 5.87 |