TREN

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

Input-referred read noise at base ISO: Olympus System OM-3 Astro 3.9 e⁻ (ISO 200), Olympus System OM-5 Mark II 4.1 e⁻ (ISO 200).

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

ISO	Olympus System OM-3 Astro	Olympus System OM-5 Mark II
64	–	0.859
80	0.973	–
100	0.807	0.768
200	0.758	0.722
250	0.871	0.859
320	1.035	0.959
400	1.214	1.125
500	1.444	1.385
640	1.670	1.670
800	2.085	1.972
1000	1.682	2.329
1250	2.014	2.809
1600	2.479	3.434
2000	3.053	3.204
2500	3.655	3.811
3200	4.500	4.563
4000	5.426	5.579
5000	6.774	6.869
6400	8.282	8.515
8000	10.126	10.703
10000	12.996	13.642
12800	16.111	17.877
16000	15.348	22.009
20000	19.698	27.665
25600	24.933	34.776
32000	30.065	–
40000	38.854	–
51200	48.503	–
64000	60.969	–
80000	76.639	–
102400	94.353	–

Popular comparisons

All cameras · Open the full tool