TREN
FujiFilm X-T200 read noise vs ISO
The FujiFilm X-T200 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 2.77 DN, or 3.4 electrons at the sensor. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 5000 don't change analog gain (digital push). Full well at base ISO is about 18,977 electrons; unity gain is around ISO 250.
FujiFilm X-T200 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 200 | 2.770 | 1.47 |
| 250 | 3.364 | 1.75 |
| 320 | 4.112 | 2.04 |
| 400 | 5.028 | 2.33 |
| 500 | 6.148 | 2.62 |
| 640 | 7.516 | 2.91 |
| 800 | 9.063 | 3.18 |
| 1000 | 11.158 | 3.48 |
| 1250 | 13.548 | 3.76 |
| 1600 | 16.679 | 4.06 |
| 2000 | 20.678 | 4.37 |
| 2500 | 25.457 | 4.67 |
| 3200 | 31.559 | 4.98 |
| 4000 | 39.947 | 5.32 |
| 5000 | 49.522 | 5.63 |
| 6400 | ▲ 26.355 | 4.72 |
| 8000 | ▲ 32.447 | 5.02 |
| 10000 | ▲ 41.070 | 5.36 |
| 12800 | ▲ 51.984 | 5.70 |