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Pentax K-7 vs Pentax K-m: read noise comparison
Pentax K-7DxO
The Pentax K-7 was measured at 7 ISO settings from ISO 100 to ISO 6400. Values were derived by Bill Claff from DxOMark lab data.
At base ISO (100) read noise is 3.48 DN. Read noise keeps falling across the measured range, so the camera isn't fully ISO-invariant there.
Pentax K-mDxO
The Pentax K-m was measured at 6 ISO settings from ISO 100 to ISO 3200. Values were derived by Bill Claff from DxOMark lab data.
At base ISO (100) read noise is 1.68 DN. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.
Pentax K-7 vs Pentax K-m read noise table
| ISO | Pentax K-7 | Pentax K-m |
|---|---|---|
| 100 | 3.482 | 1.682 |
| 200 | 4.823 | 2.657 |
| 400 | 7.362 | 5.205 |
| 800 | 12.381 | 8.634 |
| 1600 | 24.933 | 17.509 |
| 3200 | 52.710 | 36.252 |
| 6400 | 85.627 | – |
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