FujiFilm X-H2 vs FujiFilm X-H2S: read noise comparison

Input-referred read noise at base ISO: FujiFilm X-H2 2.7 e⁻ (ISO 125), FujiFilm X-H2S 4.7 e⁻ (ISO 160).

Dual gain: FujiFilm X-H2 none, FujiFilm X-H2S ISO 500.

FujiFilm X-H2

The FujiFilm X-H2 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 1.71 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 10000 don't change analog gain (digital push). Full well at base ISO is about 23,893 electrons; unity gain is around ISO 200.

FujiFilm X-H2S

The FujiFilm X-H2S was measured at 25 ISO settings from ISO 80 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (160) read noise is 2.53 DN, or 4.7 electrons at the sensor. A second gain (dual gain) kicks in at ISO 500, cutting input-referred read noise by about 1.3 stop. From ISO 3200 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 28,483 electrons; unity gain is around ISO 290.

FujiFilm X-H2 vs FujiFilm X-H2S read noise table

ISO	FujiFilm X-H2	FujiFilm X-H2S
64	1.682	–
80	2.042	2.532
100	2.445	3.031
125	1.705	3.681
160	2.071	2.532
200	2.497	3.053
250	3.053	3.655
320	3.732	4.377
400	4.659	5.352
500	3.340	2.770
640	4.141	3.434
800	5.134	4.000
1000	6.277	4.959
1250	7.890	6.148
1600	9.714	7.413
2000	12.467	9.254
2500	15.032	11.794
3200	19.160	13.737
4000	22.627	16.564
5000	29.041	20.252
6400	37.792	26.538
8000	47.505	30.484
10000	59.302	39.947
12800	65.345	48.503
25600	64.445	62.683
51200	65.799	67.182

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