Canon EOS RP vs Canon PowerShot G1 X Mark II: read noise comparison

Input-referred read noise at base ISO: Canon EOS RP 36.3 e⁻ (ISO 100), Canon PowerShot G1 X Mark II 18.1 e⁻ (ISO 100).

Canon EOS RP

The Canon EOS RP was measured at 30 ISO settings from ISO 50 to ISO 102400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 7.21 DN, or 36.3 electrons at the sensor. From ISO 10000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 40000 don't change analog gain (digital push). Full well at base ISO is about 79,455 electrons; unity gain is around ISO 500.

Canon PowerShot G1 X Mark II

The Canon PowerShot G1 X Mark II was measured at 22 ISO settings from ISO 100 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 14.32 DN, or 18.1 electrons at the sensor. From ISO 2000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 6400 don't change analog gain (digital push). Full well at base ISO is about 20,142 electrons; unity gain is around ISO 130.

Canon EOS RP vs Canon PowerShot G1 X Mark II read noise table

ISO	Canon EOS RP	Canon PowerShot G1 X Mark II
50	7.260	–
100	7.210	14.320
125	9.126	18.001
160	6.277	22.471
200	7.890	13.737
250	9.918	17.268
320	6.409	22.162
400	8.168	15.889
500	10.339	19.973
640	7.464	25.107
800	9.383	21.407
1000	11.959	27.096
1250	9.714	34.060
1600	12.381	34.060
2000	15.562	42.224
2500	14.221	52.346
3200	18.001	59.714
4000	22.943	75.061
5000	26.355	92.411
6400	33.591	113.772
8000	42.224	138.141
10000	43.411	171.255
12800	54.569	188.706
16000	68.594	–
20000	86.223	–
25600	108.383	–
32000	135.298	–
40000	166.572	–
51200	202.251	–
102400	344.892	–

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