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

Input-referred read noise at base ISO: Canon PowerShot G1 X Mark II 18.1 e⁻ (ISO 100), Canon PowerShot G1 X Mark III 5.4 e⁻ (ISO 100).

Canon PowerShot G1 X Mark II

The Canon PowerShot G1 X Mark II 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 14.32 DN, or 18.1 electrons at the sensor. From ISO 2000 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 20,142 electrons; unity gain is around ISO 130.

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

ISOCanon PowerShot G1 X Mark IICanon PowerShot G1 X Mark III
10014.3203.095
12518.0014.056
16022.4713.458
20013.7374.317
25017.2685.579
32022.1625.657
40015.8897.062
50019.9739.126
64025.10710.411
80021.40712.906
100027.09616.223
125034.06018.252
160034.06023.264
200042.22429.243
250052.34632.447
320059.71441.355
400075.06151.984
500092.41154.948
6400113.77270.035
8000138.14188.035
10000171.255110.661
12800188.706140.070
16000–171.255
20000–207.937
25600–250.732

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Data: Photons to Photos · © William J. Claff