Leica M-D (Typ 262) vs Leica M10: read noise comparison

Input-referred read noise at base ISO: Leica M-D (Typ 262) 10.4 e⁻ (ISO 200), Leica M10 5 e⁻ (ISO 100).

Leica M-D (Typ 262)

The Leica M-D (Typ 262) was measured at 16 ISO settings from ISO 200 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 3.53 DN, or 10.4 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 48,185 electrons; unity gain is around ISO 590.

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 M-D (Typ 262) vs Leica M10 read noise table

ISO	Leica M-D (Typ 262)	Leica M10
100	–	1.986
200	3.531	2.445
250	3.681	2.514
320	4.691	2.848
400	5.657	3.272
500	6.727	4.112
640	8.574	4.925
800	11.081	6.105
1000	12.467	7.727
1250	16.679	9.190
1600	21.407	11.392
2000	27.284	13.833
2500	34.297	17.509
3200	44.017	22.316
4000	54.948	26.723
5000	71.012	33.591
6400	90.510	42.814
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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