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

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

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 vs Olympus System OM-1 Mark II read noise table

ISO	Olympus System OM-1	Olympus System OM-1 Mark II
80	0.979	0.953
100	0.824	0.790
200	0.779	0.747
250	0.877	0.853
320	1.035	0.993
400	1.240	1.189
500	1.464	1.395
640	1.705	1.659
800	2.085	1.986
1000	1.705	1.625
1250	2.085	1.972
1600	2.532	2.428
2000	3.031	2.949
2500	3.681	3.555
3200	4.563	4.141
4000	5.540	5.169
5000	6.681	6.589
6400	8.282	7.727
8000	10.411	9.714
10000	12.641	12.729
12800	16.111	15.348
16000	15.780	14.621
20000	19.160	18.252
25600	24.590	22.943
32000	30.910	29.446
40000	38.055	36.758
51200	49.522	45.570
64000	60.548	56.886
80000	74.028	71.012
102400	98.360	91.139

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