FujiFilm X-A1 vs FujiFilm X-A5: read noise comparison

Input-referred read noise at base ISO: FujiFilm X-A1 5.4 e⁻ (ISO 200), FujiFilm X-A5 2.4 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-A5

The FujiFilm X-A5 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 2.16 DN, or 2.4 electrons at the sensor. From ISO 640 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 16,938 electrons; unity gain is around ISO 220.

FujiFilm X-A1 vs FujiFilm X-A5 read noise table

ISO	FujiFilm X-A1	FujiFilm X-A5
200	0.707	2.158
250	0.807	2.549
320	0.946	3.138
400	1.117	3.811
500	1.320	4.563
640	1.625	5.657
800	1.945	6.869
1000	2.346	8.225
1250	2.809	10.267
1600	3.434	12.641
2000	4.170	15.671
2500	4.563	19.160
3200	4.532	24.084
4000	4.532	29.857
5000	4.563	37.792
6400	4.627	48.503
8000	–	60.548
10000	–	76.109
12800	–	97.006

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