Leica M (Typ 240) vs Leica M (Typ 262): read noise comparison

Input-referred read noise at base ISO: Leica M (Typ 240) 7.7 e⁻ (ISO 200), Leica M (Typ 262) 13.6 e⁻ (ISO 200).

Leica M (Typ 240)

The Leica M (Typ 240) 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 3.61 DN, or 7.7 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 35,065 electrons; unity gain is around ISO 430.

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 (Typ 240) vs Leica M (Typ 262) read noise table

ISO	Leica M (Typ 240)	Leica M (Typ 262)
100	3.605	4.790
200	3.605	4.790
250	3.945	5.098
320	4.891	6.233
400	6.021	6.727
500	7.311	8.574
640	8.938	10.196
800	11.472	12.817
1000	14.520	16.564
1250	18.126	18.001
1600	23.918	22.627
2000	29.651	28.840
2500	37.792	36.252
3200	49.522	46.206
4000	61.820	58.892
5000	77.172	75.061
6400	103.250	97.681

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