FujiFilm GFX 100 vs FujiFilm GFX 100: read noise comparison

Input-referred read noise at base ISO: FujiFilm GFX 100 4 e⁻ (ISO 100), FujiFilm GFX 100 3.4 e⁻ (ISO 100).

Dual gain: FujiFilm GFX 100 ISO 800, FujiFilm GFX 100 none.

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 1.42 DN, or 4 electrons at the sensor. A second gain (dual gain) kicks in at ISO 800, cutting input-referred read noise by about 1.1 stop. From ISO 8000 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 45,323 electrons; unity gain is around ISO 280.

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 vs FujiFilm GFX 100 read noise table

ISO	FujiFilm GFX 100	FujiFilm GFX 100
50	1.087	3.580
100	1.424	5.389
125	1.693	6.635
160	2.114	8.112
200	2.158	8.398
250	2.751	10.126
320	3.340	12.906
400	4.056	15.780
500	5.134	10.056
640	6.190	12.042
800	3.732	14.723
1000	4.532	18.507
1250	5.657	23.588
1600	6.774	29.243
2000	8.694	35.753
2500	10.778	43.411
3200	13.548	53.076
4000	16.111	66.257
5000	19.427	83.286
6400	24.933	103.250
8000	30.910	133.436
10000	35.261	162.017
12800	41.643	191.341
25600	62.250	282.088
51200	65.345	308.687
102400	62.250	304.437

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