FujiFilm X-A7 vs FujiFilm X-E2: read noise comparison

Input-referred read noise at base ISO: FujiFilm X-A7 3.3 e⁻ (ISO 200), FujiFilm X-E2 3.2 e⁻ (ISO 200).

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-E2

The FujiFilm X-E2 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 1.55 DN, or 3.2 electrons at the sensor. From ISO 1000 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 31,926 electrons; unity gain is around ISO 420.

FujiFilm X-A7 vs FujiFilm X-E2 read noise table

ISO	FujiFilm X-A7	FujiFilm X-E2
200	2.848	1.548
250	3.434	1.828
320	4.228	2.219
400	5.134	2.676
500	6.233	3.272
640	7.727	3.972
800	9.383	4.891
1000	11.392	5.979
1250	14.026	7.413
1600	17.877	9.063
2000	21.556	11.236
2500	26.173	12.996
3200	33.128	12.906
4000	41.643	12.996
5000	50.563	12.996
6400	28.641	13.086
8000	34.297	–
10000	42.518	–
12800	55.715	–

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