Canon EOS Ra vs Canon PowerShot G1 X: read noise comparison

Input-referred read noise at base ISO: Canon EOS Ra 9.1 e⁻ (ISO 100), Canon PowerShot G1 X 18.5 e⁻ (ISO 100).

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 PowerShot G1 X

The Canon PowerShot G1 X 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 12.64 DN, or 18.5 electrons at the sensor. From ISO 1600 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 23,197 electrons; unity gain is around ISO 150.

Canon EOS Ra vs Canon PowerShot G1 X read noise table

ISO	Canon EOS Ra	Canon PowerShot G1 X
100	1.919	12.641
125	2.713	16.000
160	1.866	19.835
200	2.099	12.467
250	2.908	15.455
320	2.114	19.973
400	2.694	14.723
500	3.555	18.507
640	3.227	23.588
800	4.084	20.112
1000	5.278	25.634
1250	5.169	32.900
1600	6.453	30.910
2000	8.112	39.124
2500	8.815	49.180
3200	11.314	58.892
4000	14.320	74.543
5000	15.032	93.701
6400	18.636	117.784
8000	23.103	144.007
10000	29.651	178.527
12800	37.271	202.251
16000	46.851	–
20000	57.680	–
25600	72.004	–
32000	92.411	–
40000	114.563	–

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