FujiFilm GFX 50S II vs FujiFilm X-A1: read noise comparison

Input-referred read noise at base ISO: FujiFilm GFX 50S II 2.9 e⁻ (ISO 100), FujiFilm X-A1 5.4 e⁻ (ISO 200).

FujiFilm GFX 50S II

The FujiFilm GFX 50S II was measured at 26 ISO settings from ISO 50 to ISO 102400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.19 DN, or 2.9 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 39,910 electrons; unity gain is around ISO 240.

FujiFilm X-A1

The FujiFilm X-A1 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 0.71 DN, or 5.4 electrons at the sensor. From ISO 2000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 2500 don't change analog gain (digital push). Full well at base ISO is about 29,599 electrons; unity gain is around ISO 1550.

FujiFilm GFX 50S II vs FujiFilm X-A1 read noise table

ISO	FujiFilm GFX 50S II	FujiFilm X-A1
50	0.801	–
100	1.189	–
125	1.395	–
160	1.705	–
200	1.866	0.707
250	2.266	0.807
320	2.751	0.946
400	3.294	1.117
500	4.000	1.320
640	4.925	1.625
800	6.021	1.945
1000	7.260	2.346
1250	8.938	2.809
1600	10.778	3.434
2000	13.737	4.170
2500	17.148	4.563
3200	21.706	4.532
4000	27.474	4.532
5000	35.017	4.563
6400	43.411	4.627
8000	54.192	–
10000	68.594	–
12800	78.249	–
25600	80.449	–
51200	64.893	–
102400	65.799	–

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