FujiFilm X-A5 vs FujiFilm X-A7: read noise comparison

Input-referred read noise at base ISO: FujiFilm X-A5 2.4 e⁻ (ISO 200), FujiFilm X-A7 3.3 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-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-A5 vs FujiFilm X-A7 read noise table

ISO	FujiFilm X-A5	FujiFilm X-A7
200	2.158	2.848
250	2.549	3.434
320	3.138	4.228
400	3.811	5.134
500	4.563	6.233
640	5.657	7.727
800	6.869	9.383
1000	8.225	11.392
1250	10.267	14.026
1600	12.641	17.877
2000	15.671	21.556
2500	19.160	26.173
3200	24.084	33.128
4000	29.857	41.643
5000	37.792	50.563
6400	48.503	28.641
8000	60.548	34.297
10000	76.109	42.518
12800	97.006	55.715

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