Sony RX10 IV vs Sony RX100 III: read noise comparison

Input-referred read noise at base ISO: Sony RX10 IV 3.1 e⁻ (ISO 100), Sony RX100 III 2.7 e⁻ (ISO 125).

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 RX100 III

The Sony RX100 III (DSC-RX100M3) 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 3.58 DN, or 2.7 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 11,621 electrons; unity gain is around ISO 90.

Sony RX10 IV vs Sony RX100 III read noise table

ISO	Sony RX10 IV	Sony RX100 III
64	3.784	–
80	4.257	3.580
100	3.811	4.199
125	4.228	3.580
160	4.857	4.170
200	5.540	4.891
250	6.453	5.776
320	7.568	6.964
400	9.063	8.282
500	10.703	9.987
640	12.817	12.042
800	15.348	14.520
1000	18.765	17.268
1250	22.316	20.966
1600	27.284	25.992
2000	33.128	31.341
2500	41.933	37.792
3200	53.076	48.168
4000	64.000	60.969
5000	78.793	75.584
6400	95.010	76.639
8000	119.428	97.681
10000	148.056	121.938
12800	188.706	155.417

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