Leica M Monochrom vs Leica M (Typ 240): read noise comparison

Input-referred read noise at base ISO: Leica M Monochrom 13.3 e⁻ (ISO 320), Leica M (Typ 240) 7.7 e⁻ (ISO 200).

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 M (Typ 240)

The Leica M (Typ 240) was measured at 17 ISO settings from ISO 100 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 3.61 DN, or 7.7 electrons at the sensor. From ISO 250 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 35,065 electrons; unity gain is around ISO 430.

Leica M Monochrom vs Leica M (Typ 240) read noise table

ISO	Leica M Monochrom	Leica M (Typ 240)
100	–	3.605
160	7.568	–
200	–	3.605
250	–	3.945
320	7.516	4.891
400	9.318	6.021
500	11.713	7.311
640	13.833	8.938
800	17.148	11.472
1000	21.407	14.520
1250	27.284	18.126
1600	34.535	23.918
2000	42.814	29.651
2500	54.569	37.792
3200	69.071	49.522
4000	86.223	61.820
5000	109.896	77.172
6400	139.102	103.250
8000	173.645	–
10000	219.793	–

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