FujiFilm X-A1 vs FujiFilm X-A3: read noise comparison

Input-referred read noise at base ISO: FujiFilm X-A1 5.4 e⁻ (ISO 200), FujiFilm X-A3 2.6 e⁻ (ISO 200).

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 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-A1 vs FujiFilm X-A3 read noise table

ISO	FujiFilm X-A1	FujiFilm X-A3
200	0.707	2.497
250	0.807	2.990
320	0.946	3.630
400	1.117	4.469
500	1.320	5.389
640	1.625	6.774
800	1.945	8.000
1000	2.346	9.918
1250	2.809	12.042
1600	3.434	15.455
2000	4.170	18.765
2500	4.563	23.425
3200	4.532	29.041
4000	4.532	37.531
5000	4.563	45.887
6400	4.627	58.485

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