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Canon PowerShot G6 vs Canon PowerShot G7 X Mark II: read noise comparison

Input-referred read noise at base ISO: Canon PowerShot G6 5.5 e⁻ (ISO 50), Canon PowerShot G7 X Mark II 3.2 e⁻ (ISO 125).

Canon PowerShot G6

The Canon PowerShot G6 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 3.66 DN, or 5.5 electrons at the sensor. From ISO 50 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 5,944 electrons; unity gain is around ISO 70.

Canon PowerShot G7 X Mark II

The Canon PowerShot G7 X Mark II 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 3.41 DN, or 3.2 electrons at the sensor. From ISO 1250 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 13,284 electrons; unity gain is around ISO 120.

Canon PowerShot G6 vs Canon PowerShot G7 X Mark II read noise table

ISO	Canon PowerShot G6	Canon PowerShot G7 X Mark II
50	3.655	–
100	6.543	–
125	–	3.411
160	–	3.891
200	12.729	4.595
250	–	5.315
320	–	6.409
400	25.457	7.568
500	–	9.000
640	–	11.004
800	–	13.177
1000	–	16.000
1250	–	18.896
1600	–	23.425
2000	–	28.443
2500	–	34.060
3200	–	43.713
4000	–	54.192
5000	–	67.182
6400	–	86.223
8000	–	107.635
10000	–	133.436
12800	–	168.897

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