FujiFilm X-A7 vs FujiFilm X-E1: read noise comparison

Input-referred read noise at base ISO: FujiFilm X-A7 3.3 e⁻ (ISO 200), FujiFilm X-E1 5 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-E1

The FujiFilm X-E1 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 0.65 DN, or 5 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 2500 don't change analog gain (digital push). Full well at base ISO is about 29,453 electrons; unity gain is around ISO 1530.

FujiFilm X-A7 vs FujiFilm X-E1 read noise table

ISO	FujiFilm X-A7	FujiFilm X-E1
200	2.848	0.646
250	3.434	0.727
320	4.228	0.829
400	5.134	0.993
500	6.233	1.133
640	7.727	1.385
800	9.383	1.670
1000	11.392	1.986
1250	14.026	2.428
1600	17.877	2.969
2000	21.556	3.758
2500	26.173	4.532
3200	33.128	4.438
4000	41.643	4.438
5000	50.563	4.532
6400	28.641	4.408
8000	34.297	–
10000	42.518	–
12800	55.715	–

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