Sony DSC-RX100 vs Sony DSC-RX1R: read noise comparison

Input-referred read noise at base ISO: Sony DSC-RX100 10.1 e⁻ (ISO 125), Sony DSC-RX1R 4.7 e⁻ (ISO 100).

Sony DSC-RX100

The Sony DSC-RX100 was measured at 9 ISO settings from ISO 80 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (125) read noise is 3.81 DN, or 10.1 electrons at the sensor. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 3200 don't change analog gain (digital push). Full well at base ISO is about 40,970 electrons; unity gain is around ISO 330.

Sony DSC-RX1R

The Sony DSC-RX1R was measured at 28 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 1.12 DN, or 4.7 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 66,666 electrons; unity gain is around ISO 420.

Sony DSC-RX100 vs Sony DSC-RX1R read noise table

ISO	Sony DSC-RX100	Sony DSC-RX1R
50	–	1.117
64	–	1.266
80	3.811	1.454
100	4.532	1.117
125	3.811	1.266
160	–	1.464
200	5.352	1.729
250	–	2.028
320	–	2.395
400	10.556	2.888
500	–	3.482
640	–	4.228
800	19.027	5.242
1000	–	6.453
1250	–	8.112
1600	35.261	9.987
2000	–	12.729
2500	–	16.111
3200	65.799	19.973
4000	–	25.107
5000	–	31.779
6400	100.427	40.786
8000	–	50.563
10000	–	64.000
12800	–	79.893
16000	–	101.125
20000	–	127.116
25600	–	160.898

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