Sony DSC-RX10 vs Sony DSC-RX1R: read noise comparison

Input-referred read noise at base ISO: Sony DSC-RX10 2.9 e⁻ (ISO 125), Sony DSC-RX1R 4.7 e⁻ (ISO 100).

Sony DSC-RX10

The Sony DSC-RX10 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 3.84 DN, or 2.9 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 5000 don't change analog gain (digital push). Full well at base ISO is about 11,797 electrons; unity gain is around ISO 100.

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-RX10 vs Sony DSC-RX1R read noise table

ISO	Sony DSC-RX10	Sony DSC-RX1R
50	–	1.117
64	–	1.266
80	3.837	1.454
100	4.469	1.117
125	3.837	1.266
160	4.532	1.464
200	5.352	1.729
250	6.320	2.028
320	7.568	2.395
400	9.190	2.888
500	10.778	3.482
640	12.996	4.228
800	15.671	5.242
1000	18.896	6.453
1250	22.943	8.112
1600	28.246	9.987
2000	34.535	12.729
2500	42.518	16.111
3200	54.948	19.973
4000	67.649	25.107
5000	85.036	31.779
6400	84.449	40.786
8000	106.891	50.563
10000	136.239	64.000
12800	170.072	79.893
16000	–	101.125
20000	–	127.116
25600	–	160.898

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