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

Input-referred read noise at base ISO: Canon PowerShot G1 X 18.5 e⁻ (ISO 100), Canon PowerShot G1 X Mark II 18.1 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 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 vs Canon PowerShot G1 X Mark II read noise table

ISOCanon PowerShot G1 XCanon PowerShot G1 X Mark II
10012.64114.320
12516.00018.001
16019.83522.471
20012.46713.737
25015.45517.268
32019.97322.162
40014.72315.889
50018.50719.973
64023.58825.107
80020.11221.407
100025.63427.096
125032.90034.060
160030.91034.060
200039.12442.224
250049.18052.346
320058.89259.714
400074.54375.061
500093.70192.411
6400117.784113.772
8000144.007138.141
10000178.527171.255
12800202.251188.706

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Data: Photons to Photos · © William J. Claff