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Leica M MONOCHROM (Typ 246) vs Leica M (Typ 262): read noise comparison

Input-referred read noise at base ISO: Leica M MONOCHROM (Typ 246) 12.1 e⁻ (ISO 320), Leica M (Typ 262) 13.6 e⁻ (ISO 200).

Leica M MONOCHROM (Typ 246)

The Leica M MONOCHROM (Typ 246) was measured at 18 ISO settings from ISO 320 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (320) read noise is 0.97 DN, or 12.1 electrons at the sensor. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 12800 don't change analog gain (digital push). Full well at base ISO is about 51,239 electrons; unity gain is around ISO 3970.

Leica M (Typ 262)

The Leica M (Typ 262) was measured at 17 ISO settings from ISO 100 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 4.79 DN, or 13.6 electrons at the sensor. From ISO 640 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 46,199 electrons; unity gain is around ISO 570.

Leica M MONOCHROM (Typ 246) vs Leica M (Typ 262) read noise table

ISO	Leica M MONOCHROM (Typ 246)	Leica M (Typ 262)
100	–	4.790
200	–	4.790
250	–	5.098
320	0.973	6.233
400	1.021	6.727
500	1.133	8.574
640	1.357	10.196
800	1.404	12.817
1000	1.625	16.564
1250	2.071	18.001
1600	2.621	22.627
2000	3.340	28.840
2500	4.056	36.252
3200	5.134	46.206
4000	6.635	58.892
5000	8.515	75.061
6400	10.928	97.681
8000	13.642	–
10000	17.509	–
12800	21.857	–
25600	46.527	–

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