Canon PowerShot G5 vs Canon PowerShot G7 X: read noise comparison

Input-referred read noise at base ISO: Canon PowerShot G5 6.1 e⁻ (ISO 50), Canon PowerShot G7 X 2.6 e⁻ (ISO 125).

Canon PowerShot G5

The Canon PowerShot G5 was measured at 4 ISO settings from ISO 50 to ISO 400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (50) read noise is 3.05 DN, or 6.1 electrons at the sensor. From ISO 100 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 7,951 electrons; unity gain is around ISO 100.

Canon PowerShot G7 X

The Canon PowerShot G7 X was measured at 21 ISO settings from ISO 125 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (125) read noise is 0.93 DN, or 2.6 electrons at the sensor. From ISO 1000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 10,203 electrons; unity gain is around ISO 360.

Canon PowerShot G5 vs Canon PowerShot G7 X read noise table

ISO	Canon PowerShot G5	Canon PowerShot G7 X
50	3.053	–
100	5.098	–
125	–	0.927
160	–	1.094
200	9.646	1.275
250	–	1.548
320	–	1.840
400	18.896	2.204
500	–	2.621
640	–	3.227
800	–	3.837
1000	–	4.563
1250	–	5.540
1600	–	6.774
2000	–	8.282
2500	–	10.126
3200	–	12.996
4000	–	16.223
5000	–	20.393
6400	–	25.992
8000	–	32.223
10000	–	39.947
12800	–	51.268

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