TREN

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

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

The Olympus System OM-5 Mark II 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, or 4.1 electrons at the sensor. From ISO 2500 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 22,154 electrons; unity gain is around ISO 1160.

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

ISO	Olympus System OM-3	Olympus System OM-5 Mark II
64	–	0.859
80	0.940	–
100	0.790	0.768
200	0.747	0.722
250	0.865	0.859
320	0.993	0.959
400	1.197	1.125
500	1.395	1.385
640	1.693	1.670
800	2.000	1.972
1000	1.580	2.329
1250	1.986	2.809
1600	2.445	3.434
2000	2.949	3.204
2500	3.655	3.811
3200	4.347	4.563
4000	5.205	5.579
5000	6.543	6.869
6400	7.890	8.515
8000	9.849	10.703
10000	12.641	13.642
12800	15.562	17.877
16000	14.621	22.009
20000	18.636	27.665
25600	23.752	34.776
32000	29.041	–
40000	36.002	–
51200	45.887	–
64000	58.081	–
80000	71.012	–
102400	88.035	–

Popular comparisons

All cameras · Open the full tool