Olympus System OM-3 vs Olympus System OM-5: read noise comparison

Input-referred read noise at base ISO: Olympus System OM-3 3.9 e⁻ (ISO 200), Olympus System OM-5 4.1 e⁻ (ISO 200).

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-5

The Olympus System OM-5 was measured at 24 ISO settings from ISO 64 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 0.74 DN, or 4.1 electrons at the sensor. From ISO 2000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 21,203 electrons; unity gain is around ISO 1100.

Olympus System OM-3 vs Olympus System OM-5 read noise table

ISO	Olympus System OM-3	Olympus System OM-5
64	–	0.841
80	0.940	–
100	0.790	0.763
200	0.747	0.742
250	0.865	0.835
320	0.993	0.953
400	1.197	1.125
500	1.395	1.347
640	1.693	1.569
800	2.000	1.919
1000	1.580	2.297
1250	1.986	2.751
1600	2.445	3.340
2000	2.949	3.095
2500	3.655	3.655
3200	4.347	4.438
4000	5.205	5.502
5000	6.543	6.589
6400	7.890	8.694
8000	9.849	10.556
10000	12.641	13.269
12800	15.562	16.795
16000	14.621	21.407
20000	18.636	26.723
25600	23.752	33.825
32000	29.041	–
40000	36.002	–
51200	45.887	–
64000	58.081	–
80000	71.012	–
102400	88.035	–

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