Sony RX10 II vs Sony RX10 IV: read noise comparison

Input-referred read noise at base ISO: Sony RX10 II 2.8 e⁻ (ISO 100), Sony RX10 IV 3.1 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 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 II vs Sony RX10 IV read noise table

ISO	Sony RX10 II	Sony RX10 IV
64	3.182	3.784
80	3.706	4.257
100	3.204	3.811
125	3.681	4.228
160	4.257	4.857
200	4.993	5.540
250	6.021	6.453
320	7.160	7.568
400	8.574	9.063
500	10.196	10.703
640	12.210	12.817
800	14.825	15.348
1000	17.877	18.765
1250	21.857	22.316
1600	26.355	27.284
2000	31.559	33.128
2500	39.671	41.933
3200	49.180	53.076
4000	63.558	64.000
5000	78.249	78.793
6400	80.449	95.010
8000	101.829	119.428
10000	128.890	148.056
12800	160.898	188.706

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