FujiFilm GFX 100 vs FujiFilm GFX 100 II: read noise comparison

Input-referred read noise at base ISO: FujiFilm GFX 100 3.4 e⁻ (ISO 100), FujiFilm GFX 100 II 2.5 e⁻ (ISO 80).

Dual gain: FujiFilm GFX 100 none, FujiFilm GFX 100 II ISO 500.

FujiFilm GFX 100

The FujiFilm GFX 100 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 5.39 DN, or 3.4 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 12800 don't change analog gain (digital push). Full well at base ISO is about 41,534 electrons; unity gain is around ISO 60.

FujiFilm GFX 100 II

The FujiFilm GFX 100 II was measured at 27 ISO settings from ISO 40 to ISO 102400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (80) read noise is 3.07 DN, or 2.5 electrons at the sensor. A second gain (dual gain) kicks in at ISO 500, cutting input-referred read noise by about 1.4 stop. From ISO 1600 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 53,625 electrons; unity gain is around ISO 70.

FujiFilm GFX 100 vs FujiFilm GFX 100 II read noise table

ISO	FujiFilm GFX 100	FujiFilm GFX 100 II
40	–	3.272
50	3.580	–
80	–	3.074
100	5.389	5.205
125	6.635	6.498
160	8.112	7.568
200	8.398	9.000
250	10.126	11.236
320	12.906	13.737
400	15.780	17.630
500	10.056	8.282
640	12.042	9.918
800	14.723	12.641
1000	18.507	15.242
1250	23.588	20.393
1600	29.243	23.752
2000	35.753	29.041
2500	43.411	37.014
3200	53.076	44.017
4000	66.257	57.680
5000	83.286	70.035
6400	103.250	85.036
8000	133.436	106.891
10000	162.017	133.436
12800	191.341	172.446
25600	282.088	235.568
51200	308.687	249.000
102400	304.437	265.028

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