Canon EOS R10 (ES) vs Canon EOS R100: read noise comparison

Input-referred read noise at base ISO: Canon EOS R10 (ES) 8.2 e⁻ (ISO 100), Canon EOS R100 7.3 e⁻ (ISO 100).

Canon EOS R10 (ES)

The Canon EOS R10 (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 3.86 DN, or 8.2 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 33,823 electrons; unity gain is around ISO 210.

Canon EOS R100

The Canon EOS R100 was measured at 23 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 3.48 DN, or 7.3 electrons at the sensor. From ISO 5000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 12800 don't change analog gain (digital push). Full well at base ISO is about 33,045 electrons; unity gain is around ISO 210.

Canon EOS R10 (ES) vs Canon EOS R100 read noise table

ISO	Canon EOS R10 (ES)	Canon EOS R100
100	3.864	3.482
125	5.098	4.469
160	6.635	3.706
200	4.563	4.659
250	6.021	5.938
320	7.727	4.925
400	6.277	6.190
500	8.168	7.945
640	10.556	9.781
800	11.004	12.210
1000	13.833	15.562
1250	17.630	16.564
1600	19.027	20.678
2000	24.251	26.173
2500	30.274	29.243
3200	33.359	37.014
4000	41.933	46.851
5000	53.076	50.213
6400	42.224	63.119
8000	53.817	79.893
10000	67.182	98.360
12800	85.627	121.938
16000	108.383	–
20000	135.298	–
25600	171.255	233.941
32000	209.383	–
51200	310.834	–

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