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

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

ISOOlympus System OM-5Olympus System OM-5 Mark II (ES)
640.8410.818
1000.7630.753
2000.7420.722
2500.8350.818
3200.9530.946
4001.1251.117
5001.3471.320
6401.5691.591
8001.9191.905
10002.2972.329
12502.7512.809
16003.3403.411
20003.0954.141
25003.6554.959
32004.4386.190
40005.5027.890
50006.5899.987
64008.69412.467
800010.5568.574
1000013.26911.004
1280016.79514.026
1600021.40717.148
2000026.72322.009
2560033.82526.909

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Data: Photons to Photos · © William J. Claff