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Panasonic Lumix DMC-GH4 vs Panasonic Lumix DMC-GM1: read noise comparison

Input-referred read noise at base ISO: Panasonic Lumix DMC-GH4 3.9 e⁻ (ISO 200), Panasonic Lumix DMC-GM1 4.6 e⁻ (ISO 160).

Panasonic Lumix DMC-GH4

The Panasonic Lumix DMC-GH4 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 0.80 DN, or 3.9 electrons at the sensor. From ISO 640 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 19,459 electrons; unity gain is around ISO 980.

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-GH4 vs Panasonic Lumix DMC-GM1 read noise table

ISO	Panasonic Lumix DMC-GH4	Panasonic Lumix DMC-GM1
100	0.753	–
125	0.871	1.079
160	1.007	1.125
200	0.801	1.189
250	0.933	1.357
320	1.087	1.454
400	1.301	1.636
500	1.548	1.778
640	1.879	2.099
800	2.282	2.362
1000	2.789	2.713
1250	3.482	3.249
1600	4.228	3.918
2000	5.278	4.790
2500	6.543	5.816
3200	8.056	7.111
4000	10.267	8.340
5000	12.906	10.556
6400	16.223	13.177
8000	20.393	17.148
10000	25.634	21.112
12800	32.447	25.992
16000	20.535	33.591
20000	25.813	41.643
25600	32.900	51.268

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