FujiFilm X-E1 vs FujiFilm X-E2S: read noise comparison

Input-referred read noise at base ISO: FujiFilm X-E1 5 e⁻ (ISO 200), FujiFilm X-E2S 3.2 e⁻ (ISO 200).

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-E2S

The FujiFilm X-E2S 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 1600 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 31,649 electrons; unity gain is around ISO 410.

FujiFilm X-E1 vs FujiFilm X-E2S read noise table

ISO	FujiFilm X-E1	FujiFilm X-E2S
200	0.646	1.548
250	0.727	1.853
320	0.829	2.250
400	0.993	2.770
500	1.133	3.340
640	1.385	4.056
800	1.670	5.028
1000	1.986	6.063
1250	2.428	7.621
1600	2.969	9.126
2000	3.758	11.472
2500	4.532	12.729
3200	4.438	12.553
4000	4.438	12.641
5000	4.532	12.641
6400	4.408	12.729

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