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

Input-referred read noise at base ISO: FujiFilm GFX 100 3.4 e⁻ (ISO 100), FujiFilm GFX 100S 3 e⁻ (ISO 100).

Dual gain: FujiFilm GFX 100 none, FujiFilm GFX 100S 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 100S

The FujiFilm GFX 100S 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 5.13 DN, or 3 electrons at the sensor. A second gain (dual gain) kicks in at ISO 500, cutting input-referred read noise by about 1 stop. From ISO 1250 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 38,467 electrons; unity gain is around ISO 60.

FujiFilm GFX 100 vs FujiFilm GFX 100S read noise table

ISO	FujiFilm GFX 100	FujiFilm GFX 100S
50	3.580	3.482
100	5.389	5.134
125	6.635	6.190
160	8.112	7.674
200	8.398	8.000
250	10.126	9.646
320	12.906	12.210
400	15.780	15.242
500	10.056	9.318
640	12.042	11.004
800	14.723	13.361
1000	18.507	17.268
1250	23.588	21.259
1600	29.243	26.538
2000	35.753	32.672
2500	43.411	39.397
3200	53.076	49.522
4000	66.257	60.969
5000	83.286	76.639
6400	103.250	95.670
8000	133.436	121.095
10000	162.017	150.123
12800	191.341	179.769
25600	282.088	263.197
51200	308.687	282.088
102400	304.437	250.732

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