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Canon PowerShot S90 vs Canon PowerShot V1: read noise comparison

Canon PowerShot S90DxO

The Canon PowerShot S90 was measured at 7 ISO settings from ISO 80 to ISO 3200. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (80) read noise is 2.01 DN. From ISO 80 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

Canon PowerShot V1

The Canon PowerShot V1 was measured at 27 ISO settings from ISO 100 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 2.50 DN, or 4 electrons at the sensor. From ISO 20000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 25,725 electrons; unity gain is around ISO 160.

Canon PowerShot S90 vs Canon PowerShot V1 read noise table

ISOCanon PowerShot S90Canon PowerShot V1
802.014–
1002.4452.497
125–3.317
160–4.377
2004.4383.758
250–4.891
320–6.453
40011.0044.377
500–5.736
640–7.568
80021.7067.674
1000–9.781
1250–12.996
160045.88713.361
2000–16.679
2500–20.966
320082.13922.785
4000–28.840
5000–35.753
6400–44.632
8000–56.103
10000–70.035
12800–88.035
16000–109.896
20000–134.364
25600–164.279
32000–199.466
51200–286.026

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Data: Photons to Photos · © William J. Claff