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Leica C vs Leica M Monochrom: read noise comparison

Leica CDxO

The Leica C was measured at 9 ISO settings from ISO 80 to ISO 12800. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (80) read noise is 1.41 DN. Read noise keeps falling across the measured range, so the camera isn't fully ISO-invariant there.

Leica M Monochrom

The Leica M Monochrom was measured at 17 ISO settings from ISO 160 to ISO 10000. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (320) read noise is 7.52 DN, or 13.3 electrons at the sensor. From ISO 320 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 28,787 electrons; unity gain is around ISO 560.

Leica C vs Leica M Monochrom read noise table

ISOLeica CLeica M Monochrom
801.414–
1001.537–
160–7.568
2003.031–
320–7.516
4004.1709.318
500–11.713
640–13.833
8009.19017.148
1000–21.407
1250–27.284
160018.76534.535
2000–42.814
2500–54.569
320033.82569.071
4000–86.223
5000–109.896
640093.701139.102
8000–173.645
10000–219.793
12800112.206–

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Data: Photons to Photos · © William J. Claff