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

Input-referred read noise at base ISO: Canon EOS R7 4 e⁻ (ISO 100), Canon EOS R7 (ES) 7.6 e⁻ (ISO 100).

Canon EOS R7

The Canon EOS R7 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 2.46 DN, or 4 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 25,499 electrons; unity gain is around ISO 160.

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 R7 vs Canon EOS R7 (ES) read noise table

ISO	Canon EOS R7	Canon EOS R7 (ES)
100	2.462	4.257
125	3.294	5.540
160	4.408	7.160
200	3.655	5.063
250	4.757	6.543
320	6.277	8.515
400	4.170	5.502
500	5.502	7.062
640	7.210	9.254
800	7.260	8.168
1000	9.383	10.411
1250	12.295	13.269
1600	12.729	12.906
2000	16.000	16.564
2500	20.678	21.112
3200	21.407	21.112
4000	27.474	26.723
5000	34.535	33.591
6400	36.758	36.504
8000	46.527	45.887
10000	57.282	56.886
12800	71.012	70.035
16000	88.647	89.264
20000	108.383	108.383
25600	136.239	135.298
32000	165.421	164.279
51200	238.856	240.518

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