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

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

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.

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

ISO	Olympus System OM-1 Mark II	Olympus System OM-1 Mark II (ES)
80	0.953	0.946
100	0.790	0.796
200	0.747	0.747
250	0.853	0.859
320	0.993	0.993
400	1.189	1.189
500	1.395	1.414
640	1.659	1.670
800	1.986	2.028
1000	1.625	1.647
1250	1.972	1.972
1600	2.428	2.395
2000	2.949	2.908
2500	3.555	3.555
3200	4.141	4.287
4000	5.169	5.205
5000	6.589	6.364
6400	7.727	7.674
8000	9.714	9.781
10000	12.729	11.959
12800	15.348	15.242
16000	14.621	15.032
20000	18.252	18.126
25600	22.943	23.425
32000	29.446	28.840
40000	36.758	37.792
51200	45.570	46.206
64000	56.886	57.282
80000	71.012	72.004
102400	91.139	89.884

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