Sony RX10 III vs Sony RX10 IV: read noise comparison

Input-referred read noise at base ISO: Sony RX10 III 3 e⁻ (ISO 100), Sony RX10 IV 3.1 e⁻ (ISO 100).

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 IV

The Sony RX10 IV (DSC-RX10M4) 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 3.81 DN, or 3.1 electrons at the sensor. From ISO 1250 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 12,802 electrons; unity gain is around ISO 80.

Sony RX10 III vs Sony RX10 IV read noise table

ISO	Sony RX10 III	Sony RX10 IV
64	3.138	3.784
80	3.655	4.257
100	3.117	3.811
125	3.605	4.228
160	4.228	4.857
200	4.891	5.540
250	5.897	6.453
320	7.062	7.568
400	8.398	9.063
500	9.987	10.703
640	12.042	12.817
800	14.825	15.348
1000	17.268	18.765
1250	21.407	22.316
1600	26.355	27.284
2000	31.341	33.128
2500	38.586	41.933
3200	48.503	53.076
4000	63.119	64.000
5000	77.708	78.793
6400	79.341	95.010
8000	100.427	119.428
10000	125.366	148.056
12800	157.586	188.706

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