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Olympus System OM-1 Mark II (ES) vs Olympus System OM-3: read noise comparison

Input-referred read noise at base ISO: Olympus System OM-1 Mark II (ES) 4 e⁻ (ISO 200), Olympus System OM-3 3.9 e⁻ (ISO 200).

Olympus System OM-1 Mark II (ES)

The Olympus System OM-1 Mark II (ES) 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 4 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 20,548 electrons; unity gain is around ISO 1070.

Olympus System OM-3

The Olympus System OM-3 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 20,249 electrons; unity gain is around ISO 1060.

Olympus System OM-1 Mark II (ES) vs Olympus System OM-3 read noise table

ISO	Olympus System OM-1 Mark II (ES)	Olympus System OM-3
80	0.946	0.940
100	0.796	0.790
200	0.747	0.747
250	0.859	0.865
320	0.993	0.993
400	1.189	1.197
500	1.414	1.395
640	1.670	1.693
800	2.028	2.000
1000	1.647	1.580
1250	1.972	1.986
1600	2.395	2.445
2000	2.908	2.949
2500	3.555	3.655
3200	4.287	4.347
4000	5.205	5.205
5000	6.364	6.543
6400	7.674	7.890
8000	9.781	9.849
10000	11.959	12.641
12800	15.242	15.562
16000	15.032	14.621
20000	18.126	18.636
25600	23.425	23.752
32000	28.840	29.041
40000	37.792	36.002
51200	46.206	45.887
64000	57.282	58.081
80000	72.004	71.012
102400	89.884	88.035

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