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

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

Olympus System OM-1

The Olympus System OM-1 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 0.78 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 19,491 electrons; unity gain is around ISO 1010.

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

ISO	Olympus System OM-1	Olympus System OM-1 Mark II (ES)
80	0.979	0.946
100	0.824	0.796
200	0.779	0.747
250	0.877	0.859
320	1.035	0.993
400	1.240	1.189
500	1.464	1.414
640	1.705	1.670
800	2.085	2.028
1000	1.705	1.647
1250	2.085	1.972
1600	2.532	2.395
2000	3.031	2.908
2500	3.681	3.555
3200	4.563	4.287
4000	5.540	5.205
5000	6.681	6.364
6400	8.282	7.674
8000	10.411	9.781
10000	12.641	11.959
12800	16.111	15.242
16000	15.780	15.032
20000	19.160	18.126
25600	24.590	23.425
32000	30.910	28.840
40000	38.055	37.792
51200	49.522	46.206
64000	60.548	57.282
80000	74.028	72.004
102400	98.360	89.884

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