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Panasonic Lumix DMC-GH3 vs Panasonic Lumix DMC-GM1: read noise comparison

Panasonic Lumix DMC-GH3DxO

The Panasonic Lumix DMC-GH3 was measured at 7 ISO settings from ISO 125 to ISO 6400. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (125) read noise is 1.03 DN. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

Panasonic Lumix DMC-GM1

The Panasonic Lumix DMC-GM1 was measured at 24 ISO settings from ISO 125 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (160) read noise is 1.13 DN, or 4.6 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 16,132 electrons; unity gain is around ISO 650.

Panasonic Lumix DMC-GH3 vs Panasonic Lumix DMC-GM1 read noise table

ISOPanasonic Lumix DMC-GH3Panasonic Lumix DMC-GM1
1251.0281.079
160–1.125
2001.2571.189
250–1.357
320–1.454
4001.8401.636
500–1.778
640–2.099
8003.6302.362
1000–2.713
1250–3.249
16005.7363.918
2000–4.790
2500–5.816
320010.3397.111
4000–8.340
5000–10.556
640021.40713.177
8000–17.148
10000–21.112
12800–25.992
16000–33.591
20000–41.643
25600–51.268

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Data: Photons to Photos · © William J. Claff