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

Input-referred read noise at base ISO: Canon PowerShot G1 X 18.5 e⁻ (ISO 100), Canon PowerShot G1 X Mark III 5.4 e⁻ (ISO 100).

Canon PowerShot G1 X

The Canon PowerShot G1 X 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 12.64 DN, or 18.5 electrons at the sensor. From ISO 1600 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 23,197 electrons; unity gain is around ISO 150.

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 vs Canon PowerShot G1 X Mark III read noise table

ISOCanon PowerShot G1 XCanon PowerShot G1 X Mark III
10012.6413.095
12516.0004.056
16019.8353.458
20012.4674.317
25015.4555.579
32019.9735.657
40014.7237.062
50018.5079.126
64023.58810.411
80020.11212.906
100025.63416.223
125032.90018.252
160030.91023.264
200039.12429.243
250049.18032.447
320058.89241.355
400074.54351.984
500093.70154.948
6400117.78470.035
8000144.00788.035
10000178.527110.661
12800202.251140.070
16000–171.255
20000–207.937
25600–250.732

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Data: Photons to Photos · © William J. Claff