Leica M10-P vs Leica M10-R: read noise comparison

Input-referred read noise at base ISO: Leica M10-P 5.2 e⁻ (ISO 100), Leica M10-R 4.1 e⁻ (ISO 125).

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-R

The Leica M10-R was measured at 28 ISO settings from ISO 100 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (125) read noise is 2.27 DN, or 4.1 electrons at the sensor. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 29,942 electrons; unity gain is around ISO 230.

Leica M10-P vs Leica M10-R read noise table

ISO	Leica M10-P	Leica M10-R
100	1.972	2.346
125	–	2.266
160	–	2.549
200	2.329	2.969
250	–	3.387
320	–	4.056
400	2.969	3.160
500	–	3.918
640	–	4.563
800	5.464	5.464
1000	–	6.869
1250	–	8.456
1600	10.056	10.339
2000	–	12.817
2500	–	16.679
3200	19.973	20.535
4000	–	25.281
5000	–	32.447
6400	40.224	40.224
8000	–	49.180
10000	–	64.893
12800	–	80.449
16000	–	97.006
20000	–	129.787
25600	–	157.586
32000	–	187.403
40000	–	263.197
51200	–	319.573

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