TREN
Pentax K-5 II read noise vs ISO
The Pentax K-5 II was measured at 11 ISO settings from ISO 80 to ISO 51200. Values were derived by Bill Claff from DxOMark lab data.
At base ISO (80) read noise is 1.14 DN. Read noise keeps falling across the measured range, so the camera isn't fully ISO-invariant there.
Pentax K-5 II read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 80 | 1.141 | 0.19 |
| 100 | 1.301 | 0.38 |
| 200 | 2.479 | 1.31 |
| 400 | 4.287 | 2.10 |
| 800 | 7.945 | 2.99 |
| 1600 | 18.636 | 4.22 |
| 3200 | 44.632 | 5.48 |
| 6400 | 86.223 | 6.43 |
| 12800 | 164.279 | 7.36 |
| 25600 | 337.794 | 8.40 |
| 51200 | 455.087 | 8.83 |