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Panasonic Lumix DMC-GH4 vs Panasonic Lumix DMC-GM5: read noise comparison

Input-referred read noise at base ISO: Panasonic Lumix DMC-GH4 3.9 e⁻ (ISO 200), Panasonic Lumix DMC-GM5 6.8 e⁻ (ISO 100).

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-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-GH4 vs Panasonic Lumix DMC-GM5 read noise table

ISO	Panasonic Lumix DMC-GH4	Panasonic Lumix DMC-GM5
100	0.753	1.042
125	0.871	1.079
160	1.007	1.141
200	0.801	1.214
250	0.933	1.376
320	1.087	1.505
400	1.301	1.682
500	1.548	1.866
640	1.879	2.056
800	2.282	2.378
1000	2.789	2.789
1250	3.482	3.364
1600	4.228	4.000
2000	5.278	4.790
2500	6.543	5.856
3200	8.056	7.013
4000	10.267	8.634
5000	12.906	10.629
6400	16.223	12.996
8000	20.393	16.679
10000	25.634	20.966
12800	32.447	26.173
16000	20.535	33.359
20000	25.813	41.070
25600	32.900	50.213

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