Sony DSC-RX0 vs Sony DSC-RX1: read noise comparison

Input-referred read noise at base ISO: Sony DSC-RX0 3.6 e⁻ (ISO 125), Sony DSC-RX1 4.9 e⁻ (ISO 100).

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-RX1

The Sony DSC-RX1 was measured at 12 ISO settings from ISO 50 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.13 DN, or 4.9 electrons at the sensor. From ISO 400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 68,744 electrons; unity gain is around ISO 430.

Sony DSC-RX0 vs Sony DSC-RX1 read noise table

ISO	Sony DSC-RX0	Sony DSC-RX1
50	–	1.117
80	3.340	1.485
100	3.918	1.133
125	3.411	1.292
160	3.972	–
200	4.595	1.765
250	4.532	–
320	5.315	–
400	6.277	2.969
500	7.674	–
640	9.000	–
800	10.703	5.352
1000	13.086	–
1250	15.455	–
1600	19.160	10.339
2000	22.627	–
2500	26.538	–
3200	35.017	20.678
4000	44.324	–
5000	55.715	–
6400	70.035	41.070
8000	87.427	–
10000	112.206	–
12800	141.044	83.286
25600	–	164.279

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