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Panasonic Lumix DMC-GM5 vs Panasonic Lumix DMC-GX7: read noise comparison

Input-referred read noise at base ISO: Panasonic Lumix DMC-GM5 6.8 e⁻ (ISO 100), Panasonic Lumix DMC-GX7 3.4 e⁻ (ISO 125).

Panasonic Lumix DMC-GM5

The Panasonic Lumix DMC-GM5 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 (100) read noise is 1.04 DN, or 6.8 electrons at the sensor. From ISO 2000 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 25,930 electrons; unity gain is around ISO 650.

Panasonic Lumix DMC-GX7

The Panasonic Lumix DMC-GX7 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 (125) read noise is 0.65 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 20,947 electrons; unity gain is around ISO 670.

Panasonic Lumix DMC-GM5 vs Panasonic Lumix DMC-GX7 read noise table

ISOPanasonic Lumix DMC-GM5Panasonic Lumix DMC-GX7
1001.042–
1251.0790.646
1601.1410.753
2001.2140.790
2501.3760.835
3201.5050.966
4001.6821.141
5001.8661.376
6402.0561.625
8002.3781.879
10002.7892.235
12503.3642.809
16004.0003.434
20004.7904.257
25005.8565.315
32007.0136.277
40008.6347.568
500010.6299.190
640012.99611.632
800016.67915.242
1000020.96618.252
1280026.17323.103
1600033.35930.065
2000041.07036.758
2560050.21345.570

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Data: Photons to Photos · © William J. Claff