TREN
Nikon D200 read noise vs ISO
The Nikon D200 was measured at 16 ISO settings from ISO 100 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 2.19 DN, or 15.7 electrons at the sensor. From ISO 160 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 29,257 electrons; unity gain is around ISO 720.
Nikon D200 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | 2.189 | 1.13 |
| 125 | 2.713 | 1.44 |
| 160 | 3.272 | 1.71 |
| 200 | 3.945 | 1.98 |
| 250 | 4.691 | 2.23 |
| 320 | 5.776 | 2.53 |
| 400 | 7.210 | 2.85 |
| 500 | 9.000 | 3.17 |
| 640 | 11.472 | 3.52 |
| 800 | 14.929 | 3.90 |
| 1000 | 18.765 | 4.23 |
| 1250 | 23.588 | 4.56 |
| 1600 | 29.243 | 4.87 |
| 2000 | 37.531 | 5.23 |
| 2500 | 46.851 | 5.55 |
| 3200 | 58.485 | 5.87 |