FujiFilm X-A3 vs FujiFilm X-A7: read noise comparison

Input-referred read noise at base ISO: FujiFilm X-A3 2.6 e⁻ (ISO 200), FujiFilm X-A7 3.3 e⁻ (ISO 200).

FujiFilm X-A3

The FujiFilm X-A3 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 2.50 DN, or 2.6 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 3200 don't change analog gain (digital push). Full well at base ISO is about 15,848 electrons; unity gain is around ISO 210.

FujiFilm X-A7

The FujiFilm X-A7 was measured at 19 ISO settings from ISO 200 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 2.85 DN, or 3.3 electrons at the sensor. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 5000 don't change analog gain (digital push). Full well at base ISO is about 17,871 electrons; unity gain is around ISO 230.

FujiFilm X-A3 vs FujiFilm X-A7 read noise table

ISO	FujiFilm X-A3	FujiFilm X-A7
200	2.497	2.848
250	2.990	3.434
320	3.630	4.228
400	4.469	5.134
500	5.389	6.233
640	6.774	7.727
800	8.000	9.383
1000	9.918	11.392
1250	12.042	14.026
1600	15.455	17.877
2000	18.765	21.556
2500	23.425	26.173
3200	29.041	33.128
4000	37.531	41.643
5000	45.887	50.563
6400	58.485	28.641
8000	–	34.297
10000	–	42.518
12800	–	55.715

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