FujiFilm X-A3 vs FujiFilm X-A5: read noise comparison

Input-referred read noise at base ISO: FujiFilm X-A3 2.6 e⁻ (ISO 200), FujiFilm X-A5 2.4 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-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-A3 vs FujiFilm X-A5 read noise table

ISO	FujiFilm X-A3	FujiFilm X-A5
200	2.497	2.158
250	2.990	2.549
320	3.630	3.138
400	4.469	3.811
500	5.389	4.563
640	6.774	5.657
800	8.000	6.869
1000	9.918	8.225
1250	12.042	10.267
1600	15.455	12.641
2000	18.765	15.671
2500	23.425	19.160
3200	29.041	24.084
4000	37.531	29.857
5000	45.887	37.792
6400	58.485	48.503
8000	–	60.548
10000	–	76.109
12800	–	97.006

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