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Olympus E-620 vs Olympus OM-D E-M1: read noise comparison

Olympus E-620DxO

The Olympus E-620 was measured at 5 ISO settings from ISO 200 to ISO 3200. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (200) read noise is 3.97 DN. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

Olympus OM-D E-M1

The Olympus OM-D E-M1 was measured at 23 ISO settings from ISO 100 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 0.77 DN, or 3.4 electrons at the sensor. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 6400 don't change analog gain (digital push). Full well at base ISO is about 16,735 electrons; unity gain is around ISO 870.

Olympus E-620 vs Olympus OM-D E-M1 read noise table

ISOOlympus E-620Olympus OM-D E-M1
100–0.818
2003.9720.774
250–0.847
320–0.933
4005.3891.042
500–1.149
640–1.301
8008.7541.558
1000–1.879
1250–2.204
160016.4502.732
2000–3.411
2500–4.141
320034.5355.098
4000–6.320
5000–7.464
6400–9.254
8000–11.472
10000–14.320
12800–18.252
16000–22.785
20000–29.243
25600–37.014

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Data: Photons to Photos · © William J. Claff