Canon EOS M6 vs Canon EOS R: read noise comparison

Input-referred read noise at base ISO: Canon EOS M6 6.5 e⁻ (ISO 100), Canon EOS R 11.4 e⁻ (ISO 100).

Canon EOS M6

The Canon EOS M6 was measured at 25 ISO settings from ISO 100 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 3.56 DN, or 6.5 electrons at the sensor. From ISO 8000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 28,781 electrons; unity gain is around ISO 180.

Canon EOS R

The Canon EOS R was measured at 27 ISO settings from ISO 100 to ISO 40000. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 2.73 DN, or 11.4 electrons at the sensor. From ISO 5000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 66,292 electrons; unity gain is around ISO 420.

Canon EOS M6 vs Canon EOS R read noise table

ISO	Canon EOS M6	Canon EOS R
100	3.555	2.732
125	4.595	3.732
160	3.837	2.549
200	4.724	3.010
250	6.105	4.028
320	6.453	2.928
400	7.890	3.732
500	10.056	4.790
640	11.314	4.500
800	14.123	5.618
1000	18.001	7.160
1250	20.252	7.111
1600	26.173	8.938
2000	32.447	11.236
2500	36.002	11.959
3200	45.887	15.455
4000	56.886	19.027
5000	61.393	20.821
6400	77.172	25.992
8000	89.264	32.223
10000	111.430	41.355
12800	141.044	51.625
16000	170.072	64.445
20000	205.074	81.008
25600	252.476	101.829
32000	–	127.116
40000	–	157.586

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