Leica M10-P vs Leica M11: read noise comparison

Input-referred read noise at base ISO: Leica M10-P 5.2 e⁻ (ISO 100), Leica M11 4 e⁻ (ISO 64).

Dual gain: Leica M10-P none, Leica M11 ISO 200.

Leica M10-P

The Leica M10-P was measured at 7 ISO settings from ISO 100 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.97 DN, or 5.2 electrons at the sensor. From ISO 400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 42,955 electrons; unity gain is around ISO 260.

Leica M11

The Leica M11 was measured at 30 ISO settings from ISO 64 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (64) read noise is 1.27 DN, or 4 electrons at the sensor. A second gain (dual gain) kicks in at ISO 200, cutting input-referred read noise by about 1 stop. From ISO 4000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 47,875 electrons; unity gain is around ISO 200.

Leica M10-P vs Leica M11 read noise table

ISO	Leica M10-P	Leica M11
64	–	1.275
80	–	1.526
100	1.972	1.828
125	–	2.144
160	–	2.462
200	2.329	1.548
250	–	1.828
320	–	2.219
400	2.969	2.770
500	–	3.249
640	–	4.000
800	5.464	4.993
1000	–	5.856
1250	–	7.013
1600	10.056	8.634
2000	–	10.629
2500	–	12.817
3200	19.973	16.223
4000	–	19.698
5000	–	23.588
6400	40.224	29.651
8000	–	36.758
10000	–	44.324
12800	–	56.493
16000	–	69.071
20000	–	85.627
25600	–	113.772
32000	–	136.239
40000	–	168.897
51200	–	221.322

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