Canon PowerShot S95 vs Canon PowerShot V1: read noise comparison

Input-referred read noise at base ISO: Canon PowerShot S95 3.3 e⁻ (ISO 80), Canon PowerShot V1 4 e⁻ (ISO 100).

Canon PowerShot S95

The Canon PowerShot S95 was measured at 17 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 1.48 DN, or 3.3 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 8,700 electrons; unity gain is around ISO 170.

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 S95 vs Canon PowerShot V1 read noise table

ISO	Canon PowerShot S95	Canon PowerShot V1
80	1.485	–
100	1.945	2.497
125	2.428	3.317
160	3.138	4.377
200	3.837	3.758
250	4.790	4.891
320	6.148	6.453
400	7.727	4.377
500	9.448	5.736
640	12.042	7.568
800	15.137	7.674
1000	18.765	9.781
1250	23.588	12.996
1600	30.065	13.361
2000	37.271	16.679
2500	46.851	20.966
3200	58.892	22.785
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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