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

Input-referred read noise at base ISO: Canon PowerShot G7 X 2.6 e⁻ (ISO 125), Canon PowerShot G7 X Mark II 3.2 e⁻ (ISO 125).

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

ISO	Canon PowerShot G7 X	Canon PowerShot G7 X Mark II
125	0.927	3.411
160	1.094	3.891
200	1.275	4.595
250	1.548	5.315
320	1.840	6.409
400	2.204	7.568
500	2.621	9.000
640	3.227	11.004
800	3.837	13.177
1000	4.563	16.000
1250	5.540	18.896
1600	6.774	23.425
2000	8.282	28.443
2500	10.126	34.060
3200	12.996	43.713
4000	16.223	54.192
5000	20.393	67.182
6400	25.992	86.223
8000	32.223	107.635
10000	39.947	133.436
12800	51.268	168.897

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