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Panasonic Lumix DMC-GX1 vs Panasonic Lumix DMC-GX8: read noise comparison

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-GX8

The Panasonic Lumix DMC-GX8 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 0.95 DN, or 3.8 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 12800 don't change analog gain (digital push). Full well at base ISO is about 15,850 electrons; unity gain is around ISO 800.

Panasonic Lumix DMC-GX1 vs Panasonic Lumix DMC-GX8 read noise table

ISOPanasonic Lumix DMC-GX1Panasonic Lumix DMC-GX8
100–0.877
125–1.007
1603.6551.197
2004.6270.946
250–1.117
320–1.338
4005.0631.591
500–1.905
640–2.297
8005.7762.313
1000–2.789
1250–3.317
16009.2544.000
2000–4.823
2500–5.856
320020.5357.210
4000–9.000
5000–11.004
640034.06013.548
8000–17.148
10000–21.857
12800105.42027.284
16000–17.388
20000–21.556
25600–27.665

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Data: Photons to Photos · © William J. Claff