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Canon PowerShot G1 X Mark III vs Canon PowerShot G11: read noise comparison

Input-referred read noise at base ISO: Canon PowerShot G1 X Mark III 5.4 e⁻ (ISO 100), Canon PowerShot G11 3.6 e⁻ (ISO 80).

Canon PowerShot G1 X Mark III

The Canon PowerShot G1 X Mark III was measured at 25 ISO settings from ISO 100 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 3.10 DN, or 5.4 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 27,947 electrons; unity gain is around ISO 180.

Canon PowerShot G11

The Canon PowerShot G11 was measured at 7 ISO settings from ISO 80 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (80) read noise is 1.54 DN, or 3.6 electrons at the sensor. From ISO 80 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 9,246 electrons; unity gain is around ISO 190.

Canon PowerShot G1 X Mark III vs Canon PowerShot G11 read noise table

ISOCanon PowerShot G1 X Mark IIICanon PowerShot G11
80–1.537
1003.0952.028
1254.056–
1603.458–
2004.3174.028
2505.579–
3205.657–
4007.0628.056
5009.126–
64010.411–
80012.90616.000
100016.223–
125018.252–
160023.26432.223
200029.243–
250032.447–
320041.35563.119
400051.984–
500054.948–
640070.035–
800088.035–
10000110.661–
12800140.070–
16000171.255–
20000207.937–
25600250.732–

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Data: Photons to Photos · © William J. Claff