Canon EOS R vs Canon EOS R10: read noise comparison

Input-referred read noise at base ISO: Canon EOS R 11.4 e⁻ (ISO 100), Canon EOS R10 4.1 e⁻ (ISO 100).

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 R10

The Canon EOS R10 was measured at 26 ISO settings from ISO 100 to ISO 32000. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 2.01 DN, or 4.1 electrons at the sensor. From ISO 6400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 32,681 electrons; unity gain is around ISO 210.

Canon EOS R vs Canon EOS R10 read noise table

ISO	Canon EOS R	Canon EOS R10
100	2.732	2.014
125	3.732	2.676
160	2.549	3.605
200	3.010	2.789
250	4.028	3.655
320	2.928	4.925
400	3.732	4.724
500	4.790	6.277
640	4.500	8.112
800	5.618	9.318
1000	7.160	11.876
1250	7.111	15.242
1600	8.938	17.148
2000	11.236	22.009
2500	11.959	27.858
3200	15.455	31.125
4000	19.027	39.397
5000	20.821	49.867
6400	25.992	41.933
8000	32.223	53.076
10000	41.355	66.718
12800	51.625	84.449
16000	64.445	107.635
20000	81.008	135.298
25600	101.829	170.072
32000	127.116	212.306
40000	157.586	–

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