FujiFilm GFX 50S vs FujiFilm GFX 50S II: read noise comparison

Input-referred read noise at base ISO: FujiFilm GFX 50S 4.4 e⁻ (ISO 100), FujiFilm GFX 50S II 2.9 e⁻ (ISO 100).

FujiFilm GFX 50S

The FujiFilm GFX 50S 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 1.28 DN, or 4.4 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 1250 don't change analog gain (digital push). Full well at base ISO is about 56,105 electrons; unity gain is around ISO 340.

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 GFX 50S vs FujiFilm GFX 50S II read noise table

ISO	FujiFilm GFX 50S	FujiFilm GFX 50S II
50	1.275	0.801
100	1.283	1.189
125	1.537	1.395
160	1.853	1.705
200	1.945	1.866
250	2.329	2.266
320	2.828	2.751
400	3.434	3.294
500	4.170	4.000
640	5.098	4.925
800	6.105	6.021
1000	7.516	7.260
1250	9.126	8.938
1600	9.383	10.778
2000	9.448	13.737
2500	9.383	17.148
3200	9.580	21.706
4000	9.580	27.474
5000	9.514	35.017
6400	9.514	43.411
8000	9.580	54.192
10000	9.383	68.594
12800	9.580	78.249
25600	76.109	80.449
51200	63.119	64.893
102400	61.393	65.799

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