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Olympus E-420 vs Olympus E-5: read noise comparison

Olympus E-420DxO

The Olympus E-420 was measured at 5 ISO settings from ISO 100 to ISO 1600. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (100) read noise is 3.29 DN. From ISO 400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

Olympus E-5

The Olympus E-5 was measured at 19 ISO settings from ISO 100 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 3.58 DN, or 15.8 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 17,692 electrons; unity gain is around ISO 880.

Olympus E-420 vs Olympus E-5 read noise table

ISOOlympus E-420Olympus E-5
1003.2943.555
125–4.500
160–5.736
2005.3153.580
250–4.469
320–5.736
4006.8694.993
500–6.364
640–8.056
80014.0268.112
1000–10.411
1250–13.086
160029.44616.336
2000–20.393
2500–26.173
3200–31.779
4000–40.504
5000–49.522
6400–60.129

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Data: Photons to Photos · © William J. Claff