Canon EOS M6 Mark II vs Canon EOS R: read noise comparison

Input-referred read noise at base ISO: Canon EOS M6 Mark II 6.1 e⁻ (ISO 100), Canon EOS R 11.4 e⁻ (ISO 100).

Canon EOS M6 Mark II

The Canon EOS M6 Mark II 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 3.29 DN, or 6.1 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 29,216 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 Mark II vs Canon EOS R read noise table

ISO	Canon EOS M6 Mark II	Canon EOS R
100	3.294	2.732
125	4.228	3.732
160	3.182	2.549
200	3.918	3.010
250	5.134	4.028
320	3.732	2.928
400	4.659	3.732
500	6.021	4.790
640	6.869	4.500
800	8.634	5.618
1000	11.158	7.160
1250	11.004	7.111
1600	13.929	8.938
2000	18.001	11.236
2500	18.896	11.959
3200	23.588	15.455
4000	29.041	19.027
5000	31.341	20.821
6400	39.947	25.992
8000	49.180	32.223
10000	61.820	41.355
12800	78.249	51.625
16000	98.360	64.445
20000	122.786	81.008
25600	153.277	101.829
32000	–	127.116
40000	–	157.586

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