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Panasonic Lumix DMC-GH2 vs Panasonic Lumix DMC-GH4: read noise comparison

Input-referred read noise at base ISO: Panasonic Lumix DMC-GH2 5.7 e⁻ (ISO 160), Panasonic Lumix DMC-GH4 3.9 e⁻ (ISO 200).

Panasonic Lumix DMC-GH2

The Panasonic Lumix DMC-GH2 was measured at 19 ISO settings from ISO 160 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (160) read noise is 1.95 DN, or 5.7 electrons at the sensor. From ISO 1250 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 11,867 electrons; unity gain is around ISO 460.

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-GH2 vs Panasonic Lumix DMC-GH4 read noise table

ISOPanasonic Lumix DMC-GH2Panasonic Lumix DMC-GH4
100–0.753
125–0.871
1601.9451.007
2002.3780.801
2502.7890.933
3202.5321.087
4003.1601.301
5004.0281.548
6404.2281.879
8005.3152.282
10007.7272.789
12508.1683.482
16009.9184.228
200013.9295.278
250017.2686.543
320019.4278.056
400028.24610.267
500034.53512.906
6400–16.223
800049.52220.393
1000062.68325.634
1280077.17232.447
16000–20.535
20000–25.813
25600–32.900

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Data: Photons to Photos · © William J. Claff