Pentax 645D vs Pentax ist DL2: read noise comparison
Input-referred read noise at base ISO: Pentax 645D 14.5 e⁻ (ISO 100), Pentax ist DL2 17.4 e⁻ (ISO 200).
Pentax 645D
The Pentax 645D was measured at 13 ISO settings from ISO 100 to ISO 1600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 6.06 DN, or 14.5 electrons at the sensor. From ISO 125 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 39,235 electrons; unity gain is around ISO 240.
Pentax ist DL2
The Pentax ist DL2 was measured at 5 ISO settings from ISO 200 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (200) read noise is 3.01 DN, or 17.4 electrons at the sensor. From ISO 400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 22,944 electrons; unity gain is around ISO 1160.
Pentax 645D vs Pentax ist DL2 read noise table
| ISO | Pentax 645D | Pentax ist DL2 |
|---|---|---|
| 100 | 6.063 | – |
| 125 | 6.869 | – |
| 160 | 8.112 | – |
| 200 | 10.483 | 3.010 |
| 250 | 13.269 | – |
| 320 | 15.562 | – |
| 400 | 20.252 | 3.531 |
| 500 | 26.173 | – |
| 640 | 31.125 | – |
| 800 | 40.504 | 7.013 |
| 1000 | 52.346 | – |
| 1250 | 62.250 | – |
| 1600 | 80.449 | 13.929 |
| 3200 | – | 28.051 |
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