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

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

The Olympus System OM-3 Astro 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 0.76 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 19,956 electrons; unity gain is around ISO 1040.

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

ISO	Olympus System OM-3	Olympus System OM-3 Astro
80	0.940	0.973
100	0.790	0.807
200	0.747	0.758
250	0.865	0.871
320	0.993	1.035
400	1.197	1.214
500	1.395	1.444
640	1.693	1.670
800	2.000	2.085
1000	1.580	1.682
1250	1.986	2.014
1600	2.445	2.479
2000	2.949	3.053
2500	3.655	3.655
3200	4.347	4.500
4000	5.205	5.426
5000	6.543	6.774
6400	7.890	8.282
8000	9.849	10.126
10000	12.641	12.996
12800	15.562	16.111
16000	14.621	15.348
20000	18.636	19.698
25600	23.752	24.933
32000	29.041	30.065
40000	36.002	38.854
51200	45.887	48.503
64000	58.081	60.969
80000	71.012	76.639
102400	88.035	94.353

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