Sony RX100 IV vs Sony RX100 V: read noise comparison

Input-referred read noise at base ISO: Sony RX100 IV 2.8 e⁻ (ISO 125), Sony RX100 V 3.7 e⁻ (ISO 125).

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 V

The Sony RX100 V (DSC-RX100M5) 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 3.97 DN, or 3.7 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 14,558 electrons; unity gain is around ISO 120.

Sony RX100 IV vs Sony RX100 V read noise table

ISO	Sony RX100 IV	Sony RX100 V
80	3.249	3.837
100	3.758	4.257
125	3.249	3.972
160	3.732	4.438
200	4.347	5.063
250	5.242	5.897
320	6.148	6.916
400	7.362	8.112
500	8.815	9.714
640	10.556	11.551
800	12.906	13.737
1000	15.242	16.679
1250	18.636	19.973
1600	22.316	24.251
2000	27.096	29.041
2500	32.900	35.506
3200	42.224	45.255
4000	52.710	56.493
5000	66.718	70.035
6400	67.182	80.449
8000	84.449	99.044
10000	106.891	126.238
12800	135.298	155.417

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