Olympus System OM-1 Mark II vs Olympus System OM-3 read noise comparison

Olympus System OM-1 Mark II

The Olympus System OM-1 Mark II 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 20,188 electrons; unity gain is around ISO 1050.

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 Mark II vs Olympus System OM-3 read noise table

ISO	Olympus System OM-1 Mark II	Olympus System OM-3
80	0.953	0.940
100	0.790	0.790
200	0.747	0.747
250	0.853	0.865
320	0.993	0.993
400	1.189	1.197
500	1.395	1.395
640	1.659	1.693
800	1.986	2.000
1000	1.625	1.580
1250	1.972	1.986
1600	2.428	2.445
2000	2.949	2.949
2500	3.555	3.655
3200	4.141	4.347
4000	5.169	5.205
5000	6.589	6.543
6400	7.727	7.890
8000	9.714	9.849
10000	12.729	12.641
12800	15.348	15.562
16000	14.621	14.621
20000	18.252	18.636
25600	22.943	23.752
32000	29.446	29.041
40000	36.758	36.002
51200	45.570	45.887
64000	56.886	58.081
80000	71.012	71.012
102400	91.139	88.035

Popular comparisons

All cameras · Open the full tool

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