TREN
Nikon D70 read noise vs ISO
The Nikon D70 was measured at 10 ISO settings from ISO 200 to ISO 1600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (200) read noise is 3.20 DN, or 15.4 electrons at the sensor. From ISO 200 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 800 don't change analog gain (digital push). Full well at base ISO is about 19,646 electrons; unity gain is around ISO 960.
Nikon D70 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 200 | 3.204 | 1.68 |
| 250 | 3.864 | 1.95 |
| 320 | 4.627 | 2.21 |
| 400 | 5.736 | 2.52 |
| 500 | 7.013 | 2.81 |
| 640 | 8.877 | 3.15 |
| 800 | 11.004 | 3.46 |
| 1000 | ○ 13.454 | 3.75 |
| 1250 | ○ 16.111 | 4.01 |
| 1600 | ○ 19.427 | 4.28 |