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

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 (ES)

The Olympus System OM-5 Mark II (ES) 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. From ISO 8000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

Olympus System OM-3 Astro vs Olympus System OM-5 Mark II (ES) read noise table

ISOOlympus System OM-3 AstroOlympus System OM-5 Mark II (ES)
64–0.818
800.973–
1000.8070.753
2000.7580.722
2500.8710.818
3201.0350.946
4001.2141.117
5001.4441.320
6401.6701.591
8002.0851.905
10001.6822.329
12502.0142.809
16002.4793.411
20003.0534.141
25003.6554.959
32004.5006.190
40005.4267.890
50006.7749.987
64008.28212.467
800010.1268.574
1000012.99611.004
1280016.11114.026
1600015.34817.148
2000019.69822.009
2560024.93326.909
3200030.065–
4000038.854–
5120048.503–
6400060.969–
8000076.639–
10240094.353–

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Data: Photons to Photos · © William J. Claff