Pentax K100D vs Pentax K10D: read noise comparison
Input-referred read noise at base ISO: Pentax K100D 15.7 e⁻ (ISO 200), Pentax K10D 13 e⁻ (ISO 100).
Pentax K100D
The Pentax K100D 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 2.62 DN, or 15.7 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 23,788 electrons; unity gain is around ISO 1200.
Pentax K10D
The Pentax K10D 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 1.77 DN, or 13 electrons at the sensor. From ISO 500 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 30,084 electrons; unity gain is around ISO 740.
Pentax K100D vs Pentax K10D read noise table
| ISO | Pentax K100D | Pentax K10D |
|---|---|---|
| 100 | – | 1.765 |
| 125 | – | 2.282 |
| 160 | – | 2.694 |
| 200 | 2.621 | 3.506 |
| 250 | – | 4.408 |
| 320 | – | 5.278 |
| 400 | 3.458 | 6.821 |
| 500 | – | 7.362 |
| 640 | – | 8.515 |
| 800 | 6.869 | 11.392 |
| 1000 | – | 14.621 |
| 1250 | – | 17.148 |
| 1600 | 13.454 | 21.857 |
| 3200 | 27.096 | – |
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