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Panasonic Lumix DMC-LX7 vs Panasonic Lumix DMC-ZS100: read noise comparison

Panasonic Lumix DMC-LX7DxO

The Panasonic Lumix DMC-LX7 was measured at 8 ISO settings from ISO 80 to ISO 6400. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (80) read noise is 1.20 DN. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

Panasonic Lumix DMC-ZS100

The Panasonic Lumix DMC-ZS100 was measured at 26 ISO settings from ISO 80 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (125) read noise is 0.93 DN, or 3.1 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 12800 don't change analog gain (digital push). Full well at base ISO is about 13,064 electrons; unity gain is around ISO 420.

Panasonic Lumix DMC-LX7 vs Panasonic Lumix DMC-ZS100 read noise table

ISOPanasonic Lumix DMC-LX7Panasonic Lumix DMC-ZS100
801.1970.536
1001.3850.973
125–0.927
160–1.079
2002.4791.206
250–1.558
320–1.803
4003.8642.014
500–2.549
640–3.010
8008.3983.655
1000–4.377
1250–5.278
160012.0426.543
2000–7.727
2500–9.714
320022.31612.126
4000–15.137
5000–19.027
640054.94824.084
8000–30.274
10000–37.792
12800–47.177
16000–30.274
20000–38.319
25600–47.835

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Data: Photons to Photos · © William J. Claff