TREN
FujiFilm X100V read noise vs ISO
The FujiFilm X100V 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 1.83 DN, or 3.9 electrons at the sensor. A second gain (dual gain) kicks in at ISO 500, cutting input-referred read noise by about 1 stop. From ISO 2000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 33,239 electrons; unity gain is around ISO 340.
FujiFilm X100V read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 160 | 1.828 | 0.87 |
| 200 | 2.219 | 1.15 |
| 250 | 2.639 | 1.40 |
| 320 | 3.364 | 1.75 |
| 400 | 4.028 | 2.01 |
| 500 | 2.462 | 1.30 |
| 640 | 2.969 | 1.57 |
| 800 | 3.655 | 1.87 |
| 1000 | 4.500 | 2.17 |
| 1250 | 5.657 | 2.50 |
| 1600 | 6.964 | 2.80 |
| 2000 | 8.112 | 3.02 |
| 2500 | 9.987 | 3.32 |
| 3200 | 12.817 | 3.68 |
| 4000 | 15.348 | 3.94 |
| 5000 | 18.896 | 4.24 |
| 6400 | 22.785 | 4.51 |
| 8000 | 27.665 | 4.79 |
| 10000 | 37.014 | 5.21 |
| 12800 | 46.851 | 5.55 |