FujiFilm X100VI vs FujiFilm X70: read noise comparison

Input-referred read noise at base ISO: FujiFilm X100VI 2.5 e⁻ (ISO 125), FujiFilm X70 2.7 e⁻ (ISO 200).

FujiFilm X100VI

The FujiFilm X100VI was measured at 26 ISO settings from ISO 64 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (125) read noise is 1.61 DN, or 2.5 electrons at the sensor. From ISO 2500 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 12800 don't change analog gain (digital push). Full well at base ISO is about 24,053 electrons; unity gain is around ISO 200.

FujiFilm X70

The FujiFilm X70 was measured at 16 ISO settings from ISO 200 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 1.47 DN, or 2.7 electrons at the sensor. From ISO 500 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 2000 don't change analog gain (digital push). Full well at base ISO is about 27,744 electrons; unity gain is around ISO 360.

FujiFilm X100VI vs FujiFilm X70 read noise table

ISO	FujiFilm X100VI	FujiFilm X70
64	1.625	–
80	1.959	–
100	2.346	–
125	1.613	–
160	1.972	–
200	2.362	1.474
250	2.789	1.778
320	3.531	2.158
400	4.408	2.621
500	3.074	3.204
640	3.891	3.918
800	4.925	4.790
1000	5.776	6.021
1250	7.413	7.260
1600	9.448	8.815
2000	11.472	10.928
2500	14.026	12.553
3200	16.450	12.641
4000	20.678	12.729
5000	26.723	12.553
6400	33.359	12.467
8000	41.643	–
10000	53.076	–
12800	60.969	–
25600	62.250	–
51200	61.393	–

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