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

Input-referred read noise at base ISO: FujiFilm GFX 50S 4.4 e⁻ (ISO 100), FujiFilm X-A1 5.4 e⁻ (ISO 200).

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 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 vs FujiFilm X-A1 read noise table

ISO	FujiFilm GFX 50S	FujiFilm X-A1
50	1.275	–
100	1.283	–
125	1.537	–
160	1.853	–
200	1.945	0.707
250	2.329	0.807
320	2.828	0.946
400	3.434	1.117
500	4.170	1.320
640	5.098	1.625
800	6.105	1.945
1000	7.516	2.346
1250	9.126	2.809
1600	9.383	3.434
2000	9.448	4.170
2500	9.383	4.563
3200	9.580	4.532
4000	9.580	4.532
5000	9.514	4.563
6400	9.514	4.627
8000	9.580	–
10000	9.383	–
12800	9.580	–
25600	76.109	–
51200	63.119	–
102400	61.393	–

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