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Panasonic Lumix DMC-GH3 vs Panasonic Lumix DMC-GH4: 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-GH4

The Panasonic Lumix DMC-GH4 was measured at 25 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 0.80 DN, or 3.9 electrons at the sensor. From ISO 640 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 12800 don't change analog gain (digital push). Full well at base ISO is about 19,459 electrons; unity gain is around ISO 980.

Panasonic Lumix DMC-GH3 vs Panasonic Lumix DMC-GH4 read noise table

ISOPanasonic Lumix DMC-GH3Panasonic Lumix DMC-GH4
100–0.753
1251.0280.871
160–1.007
2001.2570.801
250–0.933
320–1.087
4001.8401.301
500–1.548
640–1.879
8003.6302.282
1000–2.789
1250–3.482
16005.7364.228
2000–5.278
2500–6.543
320010.3398.056
4000–10.267
5000–12.906
640021.40716.223
8000–20.393
10000–25.634
12800–32.447
16000–20.535
20000–25.813
25600–32.900

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Data: Photons to Photos · © William J. Claff