Olympus System OM-1 vs Olympus System OM-3: read noise comparison

Input-referred read noise at base ISO: Olympus System OM-1 4 e⁻ (ISO 200), Olympus System OM-3 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-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 vs Olympus System OM-3 read noise table

ISO	Olympus System OM-1	Olympus System OM-3
80	0.979	0.940
100	0.824	0.790
200	0.779	0.747
250	0.877	0.865
320	1.035	0.993
400	1.240	1.197
500	1.464	1.395
640	1.705	1.693
800	2.085	2.000
1000	1.705	1.580
1250	2.085	1.986
1600	2.532	2.445
2000	3.031	2.949
2500	3.681	3.655
3200	4.563	4.347
4000	5.540	5.205
5000	6.681	6.543
6400	8.282	7.890
8000	10.411	9.849
10000	12.641	12.641
12800	16.111	15.562
16000	15.780	14.621
20000	19.160	18.636
25600	24.590	23.752
32000	30.910	29.041
40000	38.055	36.002
51200	49.522	45.887
64000	60.548	58.081
80000	74.028	71.012
102400	98.360	88.035

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