Canon EOS R7 (ES) vs Canon EOS Ra: read noise comparison

Input-referred read noise at base ISO: Canon EOS R7 (ES) 7.6 e⁻ (ISO 100), Canon EOS Ra 9.1 e⁻ (ISO 100).

Canon EOS R7 (ES)

The Canon EOS R7 (ES) was measured at 27 ISO settings from ISO 100 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 4.26 DN, or 7.6 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 32000 don't change analog gain (digital push). Full well at base ISO is about 28,452 electrons; unity gain is around ISO 180.

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 R7 (ES) vs Canon EOS Ra read noise table

ISO	Canon EOS R7 (ES)	Canon EOS Ra
100	4.257	1.919
125	5.540	2.713
160	7.160	1.866
200	5.063	2.099
250	6.543	2.908
320	8.515	2.114
400	5.502	2.694
500	7.062	3.555
640	9.254	3.227
800	8.168	4.084
1000	10.411	5.278
1250	13.269	5.169
1600	12.906	6.453
2000	16.564	8.112
2500	21.112	8.815
3200	21.112	11.314
4000	26.723	14.320
5000	33.591	15.032
6400	36.504	18.636
8000	45.887	23.103
10000	56.886	29.651
12800	70.035	37.271
16000	89.264	46.851
20000	108.383	57.680
25600	135.298	72.004
32000	164.279	92.411
40000	–	114.563
51200	240.518	–

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