FujiFilm X-A5 vs FujiFilm X-E1: read noise comparison

Input-referred read noise at base ISO: FujiFilm X-A5 2.4 e⁻ (ISO 200), FujiFilm X-E1 5 e⁻ (ISO 200).

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-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-A5 vs FujiFilm X-E1 read noise table

ISO	FujiFilm X-A5	FujiFilm X-E1
200	2.158	0.646
250	2.549	0.727
320	3.138	0.829
400	3.811	0.993
500	4.563	1.133
640	5.657	1.385
800	6.869	1.670
1000	8.225	1.986
1250	10.267	2.428
1600	12.641	2.969
2000	15.671	3.758
2500	19.160	4.532
3200	24.084	4.438
4000	29.857	4.438
5000	37.792	4.532
6400	48.503	4.408
8000	60.548	–
10000	76.109	–
12800	97.006	–

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