TREN
Nikon D3200 read noise vs ISO
The Nikon D3200 was measured at 8 ISO settings from ISO 100 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 0.63 DN, or 4.4 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 6400 don't change analog gain (digital push). Full well at base ISO is about 28,739 electrons; unity gain is around ISO 700.
Nikon D3200 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | 0.629 | -0.67 |
| 200 | 0.790 | -0.34 |
| 400 | 1.474 | 0.56 |
| 800 | 2.497 | 1.32 |
| 1600 | 4.000 | 2.00 |
| 3200 | 7.413 | 2.89 |
| 6400 | 15.137 | 3.92 |
| 12800 | ○ 30.274 | 4.92 |