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Olympus System OM-1 Mark II vs Panasonic Lumix G9 II: read noise comparison

Input-referred read noise at base ISO: Olympus System OM-1 Mark II 3.9 e⁻ (ISO 200), Panasonic Lumix G9 II 2.5 e⁻ (ISO 100).

Olympus System OM-1 Mark II

The Olympus System OM-1 Mark II was measured at 30 ISO settings from ISO 80 to ISO 102400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 0.75 DN, or 3.9 electrons at the sensor. From ISO 16000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 20,188 electrons; unity gain is around ISO 1050.

Panasonic Lumix G9 II

The Panasonic Lumix G9 II (Lumix DC-G9M2) was measured at 28 ISO settings from ISO 50 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 9.78 DN, or 2.5 electrons at the sensor. From ISO 3200 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 16,380 electrons; unity gain is around ISO 30.

Olympus System OM-1 Mark II vs Panasonic Lumix G9 II read noise table

ISO	Olympus System OM-1 Mark II	Panasonic Lumix G9 II
50	–	9.254
64	–	9.318
80	0.953	9.580
100	0.790	9.781
125	–	10.126
160	–	10.629
200	0.747	10.339
250	0.853	11.004
320	0.993	11.959
400	1.189	14.026
500	1.395	16.336
640	1.659	19.160
800	1.986	21.857
1000	1.625	26.173
1250	1.972	32.223
1600	2.428	40.224
2000	2.949	49.522
2500	3.555	61.820
3200	4.141	62.683
4000	5.169	77.708
5000	6.589	98.360
6400	7.727	123.640
8000	9.714	156.498
10000	12.729	195.361
12800	15.348	247.280
16000	14.621	310.834
20000	18.252	396.177
25600	22.943	497.999
32000	29.446	–
40000	36.758	–
51200	45.570	–
64000	56.886	–
80000	71.012	–
102400	91.139	–

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