Pentax K-5 II vs Pentax K-50: read noise comparison
Pentax K-5 IIDxO
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-50
The Pentax K-50 was measured at 28 ISO settings from ISO 100 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 0.59 DN, or 7.2 electrons at the sensor. From ISO 400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 1250 don't change analog gain (digital push). Full well at base ISO is about 49,740 electrons; unity gain is around ISO 1210.
Pentax K-5 II vs Pentax K-50 read noise table
| ISO | Pentax K-5 II | Pentax K-50 |
|---|---|---|
| 80 | 1.141 | – |
| 100 | 1.301 | 0.590 |
| 125 | – | 0.637 |
| 160 | – | 0.697 |
| 200 | 2.479 | 0.895 |
| 250 | – | 1.035 |
| 320 | – | 1.206 |
| 400 | 4.287 | 1.485 |
| 500 | – | 1.840 |
| 640 | – | 2.144 |
| 800 | 7.945 | 2.676 |
| 1000 | – | 3.411 |
| 1250 | – | 3.972 |
| 1600 | 18.636 | 4.408 |
| 2000 | – | 5.464 |
| 2500 | – | 6.277 |
| 3200 | 44.632 | 7.210 |
| 4000 | – | 9.254 |
| 5000 | – | 11.392 |
| 6400 | 86.223 | 13.929 |
| 8000 | – | 17.877 |
| 10000 | – | 22.471 |
| 12800 | 164.279 | 28.246 |
| 16000 | – | 35.506 |
| 20000 | – | 42.814 |
| 25600 | 337.794 | 54.569 |
| 32000 | – | 71.012 |
| 40000 | – | 88.035 |
| 51200 | 455.087 | 109.137 |
Popular comparisons
- Sony a7 IV vs Nikon Z 6III
- Sony a7 IV vs Canon EOS R6 Mark II
- Nikon Z 6III vs Canon EOS R6 Mark II
- Sony a7 V vs Sony a7 IV
- Sony a7 IV vs Sony a7 III
- Canon EOS R6 Mark III vs Canon EOS R6 Mark II
- Sony a7 V vs Canon EOS R6 Mark III
- Sony a7R V vs Nikon Z 8
- Canon EOS R5 Mark II vs Sony a7R V
- Canon EOS R5 Mark II vs Nikon Z 8
- Canon EOS R5 Mark II vs Canon EOS R5
- Sony a7R V vs Sony a7R IV