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Panasonic Lumix DMC-GX7 vs Panasonic Lumix DMC-GX80: read noise comparison

Input-referred read noise at base ISO: Panasonic Lumix DMC-GX7 3.4 e⁻ (ISO 125), Panasonic Lumix DMC-GX80 3.7 e⁻ (ISO 100).

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-GX80

The Panasonic Lumix DMC-GX80 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 0.54 DN, or 3.7 electrons at the sensor. From ISO 1000 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 27,276 electrons; unity gain is around ISO 690.

Panasonic Lumix DMC-GX7 vs Panasonic Lumix DMC-GX80 read noise table

ISOPanasonic Lumix DMC-GX7Panasonic Lumix DMC-GX80
100–0.540
1250.6460.642
1600.7530.758
2000.7900.807
2500.8350.865
3200.9660.953
4001.1411.102
5001.3761.329
6401.6251.569
8001.8791.815
10002.2352.189
12502.8092.639
16003.4343.272
20004.2574.028
25005.3154.925
32006.2776.190
40007.5687.516
50009.1909.514
640011.63211.794
800015.24215.348
1000018.25218.765
1280023.10323.588
1600030.06530.065
2000036.75836.758
2560045.57046.527

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Data: Photons to Photos · © William J. Claff