TREN
Samsung NX1 read noise vs ISO
The Samsung NX1 was measured at 26 ISO settings from ISO 100 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 1.80 DN, or 3.1 electrons at the sensor. From ISO 500 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 27,428 electrons; unity gain is around ISO 170.
Samsung NX1 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | 1.803 | 0.85 |
| 125 | 2.129 | 1.09 |
| 160 | 2.585 | 1.37 |
| 200 | 3.204 | 1.68 |
| 250 | 3.837 | 1.94 |
| 320 | 4.595 | 2.20 |
| 400 | 5.540 | 2.47 |
| 500 | 6.681 | 2.74 |
| 640 | 8.282 | 3.05 |
| 800 | 9.987 | 3.32 |
| 1000 | 12.210 | 3.61 |
| 1250 | 15.348 | 3.94 |
| 1600 | 18.765 | 4.23 |
| 2000 | 23.588 | 4.56 |
| 2500 | 30.274 | 4.92 |
| 3200 | 37.271 | 5.22 |
| 4000 | 46.206 | 5.53 |
| 5000 | 59.714 | 5.90 |
| 6400 | 72.505 | 6.18 |
| 8000 | 93.701 | 6.55 |
| 10000 | 121.095 | 6.92 |
| 12800 | 151.167 | 7.24 |
| 16000 | ○ 173.645 | 7.44 |
| 20000 | ○ 215.269 | 7.75 |
| 25600 | ○ 266.871 | 8.06 |
| 51200 | ○ 508.463 | 8.99 |