Leica M10 vs Leica M10-P: read noise comparison

Input-referred read noise at base ISO: Leica M10 5 e⁻ (ISO 100), Leica M10-P 5.2 e⁻ (ISO 100).

Leica M10

The Leica M10 was measured at 26 ISO settings from ISO 100 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.99 DN, or 5 electrons at the sensor. From ISO 640 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 20000 don't change analog gain (digital push). Full well at base ISO is about 41,004 electrons; unity gain is around ISO 500.

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 M10 vs Leica M10-P read noise table

ISO	Leica M10	Leica M10-P
100	1.986	1.972
200	2.445	2.329
250	2.514	–
320	2.848	–
400	3.272	2.969
500	4.112	–
640	4.925	–
800	6.105	5.464
1000	7.727	–
1250	9.190	–
1600	11.392	10.056
2000	13.833	–
2500	17.509	–
3200	22.316	19.973
4000	26.723	–
5000	33.591	–
6400	42.814	40.224
8000	52.346	–
10000	71.012	–
12800	88.647	–
16000	109.896	–
20000	132.514	–
25600	198.088	–
32000	238.856	–
40000	306.555	–
51200	367.093	–

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