Sony RX10 II vs Sony RX10 III: read noise comparison

Input-referred read noise at base ISO: Sony RX10 II 2.8 e⁻ (ISO 100), Sony RX10 III 3 e⁻ (ISO 100).

Sony RX10 II

The Sony RX10 II (DSC-RX10M2) was measured at 24 ISO settings from ISO 64 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 3.20 DN, or 2.8 electrons at the sensor. From ISO 1000 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 13,736 electrons; unity gain is around ISO 90.

Sony RX10 III

The Sony RX10 III (DSC-RX10M3) was measured at 24 ISO settings from ISO 64 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 3.12 DN, or 3 electrons at the sensor. From ISO 6400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 14,868 electrons; unity gain is around ISO 100.

Sony RX10 II vs Sony RX10 III read noise table

ISO	Sony RX10 II	Sony RX10 III
64	3.182	3.138
80	3.706	3.655
100	3.204	3.117
125	3.681	3.605
160	4.257	4.228
200	4.993	4.891
250	6.021	5.897
320	7.160	7.062
400	8.574	8.398
500	10.196	9.987
640	12.210	12.042
800	14.825	14.825
1000	17.877	17.268
1250	21.857	21.407
1600	26.355	26.355
2000	31.559	31.341
2500	39.671	38.586
3200	49.180	48.503
4000	63.558	63.119
5000	78.249	77.708
6400	80.449	79.341
8000	101.829	100.427
10000	128.890	125.366
12800	160.898	157.586

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