TREN
Samsung NX500 read noise vs ISO
The Samsung NX500 was measured at 25 ISO settings from ISO 100 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 1.78 DN, or 3.4 electrons at the sensor. 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 31,154 electrons; unity gain is around ISO 190.
Samsung NX500 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | 1.778 | 0.83 |
| 125 | 1.972 | 0.98 |
| 160 | 2.497 | 1.32 |
| 200 | 2.908 | 1.54 |
| 250 | 3.411 | 1.77 |
| 320 | 4.170 | 2.06 |
| 400 | 5.169 | 2.37 |
| 500 | 6.148 | 2.62 |
| 640 | 7.674 | 2.94 |
| 800 | 9.514 | 3.25 |
| 1000 | 11.158 | 3.48 |
| 1250 | 14.123 | 3.82 |
| 1600 | 17.388 | 4.12 |
| 2000 | 20.821 | 4.38 |
| 2500 | 26.538 | 4.73 |
| 3200 | 33.128 | 5.05 |
| 4000 | 40.504 | 5.34 |
| 5000 | 53.076 | 5.73 |
| 6400 | 65.345 | 6.03 |
| 8000 | 79.893 | 6.32 |
| 10000 | 103.968 | 6.70 |
| 12800 | 129.787 | 7.02 |
| 16000 | 152.219 | 7.25 |
| 20000 | 187.403 | 7.55 |
| 25600 | 230.720 | 7.85 |