Sony RX100 III vs Sony RX100 IV: read noise comparison

Input-referred read noise at base ISO: Sony RX100 III 2.7 e⁻ (ISO 125), Sony RX100 IV 2.8 e⁻ (ISO 125).

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 RX100 IV

The Sony RX100 IV (DSC-RX100M4) 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 3.25 DN, or 2.8 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 13,145 electrons; unity gain is around ISO 110.

Sony RX100 III vs Sony RX100 IV read noise table

ISO	Sony RX100 III	Sony RX100 IV
80	3.580	3.249
100	4.199	3.758
125	3.580	3.249
160	4.170	3.732
200	4.891	4.347
250	5.776	5.242
320	6.964	6.148
400	8.282	7.362
500	9.987	8.815
640	12.042	10.556
800	14.520	12.906
1000	17.268	15.242
1250	20.966	18.636
1600	25.992	22.316
2000	31.341	27.096
2500	37.792	32.900
3200	48.168	42.224
4000	60.969	52.710
5000	75.584	66.718
6400	76.639	67.182
8000	97.681	84.449
10000	121.938	106.891
12800	155.417	135.298

Popular comparisons

All cameras · Open the full tool