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Panasonic Lumix DMC-GM1 vs Panasonic Lumix DMC-GX1: read noise comparison

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-GX1DxO

The Panasonic Lumix DMC-GX1 was measured at 8 ISO settings from ISO 160 to ISO 12800. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (160) read noise is 3.66 DN. From ISO 6400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

Panasonic Lumix DMC-GM1 vs Panasonic Lumix DMC-GX1 read noise table

ISOPanasonic Lumix DMC-GM1Panasonic Lumix DMC-GX1
1251.079–
1601.1253.655
2001.1894.627
2501.357–
3201.454–
4001.6365.063
5001.778–
6402.099–
8002.3625.776
10002.713–
12503.249–
16003.9189.254
20004.790–
25005.816–
32007.11120.535
40008.340–
500010.556–
640013.17734.060
800017.148–
1000021.112–
1280025.992105.420
1600033.591–
2000041.643–
2560051.268–

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Data: Photons to Photos · © William J. Claff