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

Input-referred read noise at base ISO: Leica M10 MONOCHROM 6.1 e⁻ (ISO 160), Leica M10-R 4.1 e⁻ (ISO 125).

Leica M10 MONOCHROM

The Leica M10 MONOCHROM was measured at 29 ISO settings from ISO 160 to ISO 102400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (160) read noise is 2.14 DN, or 6.1 electrons at the sensor. From ISO 1250 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 46,751 electrons; unity gain is around ISO 450.

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 MONOCHROM vs Leica M10-R read noise table

ISO	Leica M10 MONOCHROM	Leica M10-R
100	–	2.346
125	–	2.266
160	2.144	2.549
200	2.329	2.969
250	2.250	3.387
320	2.428	4.056
400	2.848	3.160
500	3.074	3.918
640	3.837	4.563
800	2.928	5.464
1000	3.655	6.869
1250	4.084	8.456
1600	4.891	10.339
2000	6.233	12.817
2500	7.568	16.679
3200	9.448	20.535
4000	11.632	25.281
5000	14.825	32.447
6400	18.507	40.224
8000	23.264	49.180
10000	29.446	64.893
12800	36.002	80.449
16000	44.942	97.006
20000	58.485	129.787
25600	72.004	157.586
32000	89.264	187.403
40000	121.938	263.197
51200	146.018	319.573
64000	176.069	–
80000	247.280	–
102400	296.112	–

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