Sony DSC-R1 vs Sony DSC-RX0: read noise comparison

Input-referred read noise at base ISO: Sony DSC-R1 10.5 e⁻ (ISO 200), Sony DSC-RX0 3.6 e⁻ (ISO 125).

Sony DSC-R1

The Sony DSC-R1 was measured at 5 ISO settings from ISO 200 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 12.91 DN, or 10.5 electrons at the sensor. From ISO 200 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 12,866 electrons; unity gain is around ISO 160.

Sony DSC-RX0

The Sony DSC-RX0 was measured at 23 ISO settings from ISO 80 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (125) read noise is 3.41 DN, or 3.6 electrons at the sensor. From ISO 1250 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 16,280 electrons; unity gain is around ISO 130.

Sony DSC-R1 vs Sony DSC-RX0 read noise table

ISO	Sony DSC-R1	Sony DSC-RX0
80	–	3.340
100	–	3.918
125	–	3.411
160	–	3.972
200	12.906	4.595
250	–	4.532
320	–	5.315
400	26.173	6.277
500	–	7.674
640	–	9.000
800	49.522	10.703
1000	–	13.086
1250	–	15.455
1600	99.044	19.160
2000	–	22.627
2500	–	26.538
3200	192.672	35.017
4000	–	44.324
5000	–	55.715
6400	–	70.035
8000	–	87.427
10000	–	112.206
12800	–	141.044

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