Olympus System OM-3 vs Olympus System OM-5 Mark II (ES) read noise comparison

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 Mark II (ES)

The Olympus System OM-5 Mark II (ES) 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 0.72 DN. From ISO 8000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

Olympus System OM-3 vs Olympus System OM-5 Mark II (ES) read noise table

ISO	Olympus System OM-3	Olympus System OM-5 Mark II (ES)
64	–	0.818
80	0.940	–
100	0.790	0.753
200	0.747	0.722
250	0.865	0.818
320	0.993	0.946
400	1.197	1.117
500	1.395	1.320
640	1.693	1.591
800	2.000	1.905
1000	1.580	2.329
1250	1.986	2.809
1600	2.445	3.411
2000	2.949	4.141
2500	3.655	4.959
3200	4.347	6.190
4000	5.205	7.890
5000	6.543	9.987
6400	7.890	12.467
8000	9.849	8.574
10000	12.641	11.004
12800	15.562	14.026
16000	14.621	17.148
20000	18.636	22.009
25600	23.752	26.909
32000	29.041	–
40000	36.002	–
51200	45.887	–
64000	58.081	–
80000	71.012	–
102400	88.035	–

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Olympus System OM-3 vs Olympus System OM-5 Mark II (ES): read noise comparison