Sony a580 vs Sony a6000: read noise comparison
Sony a580DxO
The Sony a580 (DSLR-A580) was measured at 8 ISO settings from ISO 100 to ISO 12800. Values were derived by Bill Claff from DxOMark lab data.
At base ISO (100) read noise is 0.55 DN. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.
Sony a6000
The Sony a6000 (ILCE-6000) 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 2.45 DN, or 5 electrons at the sensor. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 10000 don't change analog gain (digital push). Full well at base ISO is about 32,205 electrons; unity gain is around ISO 200.
Sony a580 vs Sony a6000 read noise table
| ISO | Sony a580 | Sony a6000 |
|---|---|---|
| 100 | 0.547 | 2.445 |
| 125 | – | 2.848 |
| 160 | – | 3.160 |
| 200 | 0.707 | 3.605 |
| 250 | – | 4.347 |
| 320 | – | 5.098 |
| 400 | 1.283 | 6.105 |
| 500 | – | 7.311 |
| 640 | – | 8.815 |
| 800 | 1.972 | 10.703 |
| 1000 | – | 13.086 |
| 1250 | – | 15.780 |
| 1600 | 4.317 | 19.027 |
| 2000 | – | 23.264 |
| 2500 | – | 28.443 |
| 3200 | 8.754 | 34.535 |
| 4000 | – | 43.713 |
| 5000 | – | 53.817 |
| 6400 | 20.112 | 64.000 |
| 8000 | – | 82.711 |
| 10000 | – | 103.250 |
| 12800 | 38.854 | 102.537 |
| 16000 | – | 128.890 |
| 20000 | – | 163.144 |
| 25600 | – | 203.657 |
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