Olympus E-1 vs Olympus E-30: read noise comparison
Input-referred read noise at base ISO: Olympus E-1 18 e⁻ (ISO 100), Olympus E-30 15.2 e⁻ (ISO 200).
Olympus E-1
The Olympus E-1 was measured at 6 ISO settings from ISO 100 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 2.25 DN, or 18 electrons at the sensor. From ISO 100 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 800 don't change analog gain (digital push). Full well at base ISO is about 32,271 electrons; unity gain is around ISO 800.
Olympus E-30
The Olympus E-30 was measured at 16 ISO settings from ISO 100 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (200) read noise is 3.63 DN, or 15.2 electrons at the sensor. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 16,969 electrons; unity gain is around ISO 840.
Olympus E-1 vs Olympus E-30 read noise table
| ISO | Olympus E-1 | Olympus E-30 |
|---|---|---|
| 100 | 2.250 | 3.555 |
| 125 | – | 4.563 |
| 160 | – | 5.776 |
| 200 | 4.317 | 3.630 |
| 250 | – | 4.532 |
| 320 | – | 5.776 |
| 400 | 8.754 | 5.134 |
| 500 | – | 6.409 |
| 640 | – | 8.168 |
| 800 | 17.268 | 8.340 |
| 1000 | – | 10.629 |
| 1250 | – | 13.737 |
| 1600 | 17.268 | 16.795 |
| 2000 | – | 21.407 |
| 2500 | – | 26.909 |
| 3200 | 17.388 | 32.900 |
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