Canon EOS R8 vs Canon EOS Ra: read noise comparison

Input-referred read noise at base ISO: Canon EOS R8 6.1 e⁻ (ISO 100), Canon EOS Ra 9.1 e⁻ (ISO 100).

Canon EOS R8

The Canon EOS R8 was measured at 33 ISO settings from ISO 50 to ISO 204800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.04 DN, or 6.1 electrons at the sensor. From ISO 6400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 102400 don't change analog gain (digital push). Full well at base ISO is about 92,859 electrons; unity gain is around ISO 590.

Canon EOS Ra

The Canon EOS Ra 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 1.92 DN, or 9.1 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 75,089 electrons; unity gain is around ISO 470.

Canon EOS R8 vs Canon EOS Ra read noise table

ISO	Canon EOS R8	Canon EOS Ra
50	1.042	–
100	1.035	1.919
125	1.454	2.713
160	2.042	1.866
200	1.505	2.099
250	2.071	2.908
320	2.868	2.114
400	1.257	2.694
500	1.778	3.555
640	2.479	3.227
800	2.099	4.084
1000	2.848	5.278
1250	3.837	5.169
1600	3.891	6.453
2000	5.028	8.112
2500	6.453	8.815
3200	7.210	11.314
4000	8.938	14.320
5000	11.314	15.032
6400	12.210	18.636
8000	15.562	23.103
10000	19.562	29.651
12800	24.251	37.271
16000	30.484	46.851
20000	38.319	57.680
25600	48.840	72.004
32000	59.714	92.411
40000	76.109	114.563
51200	96.336	–
64000	122.786	–
80000	152.219	–
102400	194.012	–
204800	282.088	–

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