Pentax K10D vs Pentax K200D: read noise comparison
Input-referred read noise at base ISO: Pentax K10D 13 e⁻ (ISO 100), Pentax K200D 9 e⁻ (ISO 100).
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 K200D
The Pentax K200D 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 1.25 DN, or 9 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 29,659 electrons; unity gain is around ISO 730.
Pentax K10D vs Pentax K200D read noise table
| ISO | Pentax K10D | Pentax K200D |
|---|---|---|
| 100 | 1.765 | 1.248 |
| 125 | 2.282 | 1.580 |
| 160 | 2.694 | 1.753 |
| 200 | 3.506 | 2.250 |
| 250 | 4.408 | 2.888 |
| 320 | 5.278 | 3.317 |
| 400 | 6.821 | 4.408 |
| 500 | 7.362 | 3.138 |
| 640 | 8.515 | 4.028 |
| 800 | 11.392 | 5.618 |
| 1000 | 14.621 | 6.869 |
| 1250 | 17.148 | 8.225 |
| 1600 | 21.857 | 10.853 |
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