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

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

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

ISO	Olympus System OM-5	Olympus System OM-5 Mark II
64	0.841	0.859
100	0.763	0.768
200	0.742	0.722
250	0.835	0.859
320	0.953	0.959
400	1.125	1.125
500	1.347	1.385
640	1.569	1.670
800	1.919	1.972
1000	2.297	2.329
1250	2.751	2.809
1600	3.340	3.434
2000	3.095	3.204
2500	3.655	3.811
3200	4.438	4.563
4000	5.502	5.579
5000	6.589	6.869
6400	8.694	8.515
8000	10.556	10.703
10000	13.269	13.642
12800	16.795	17.877
16000	21.407	22.009
20000	26.723	27.665
25600	33.825	34.776

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