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FujiFilm X-T4 vs FujiFilm X-T5 (ES): read noise comparison

Dual gain: FujiFilm X-T4 ISO 500, FujiFilm X-T5 (ES) none.

FujiFilm X-T4

The FujiFilm X-T4 was measured at 20 ISO settings from ISO 160 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (160) read noise is 1.85 DN, or 5.5 electrons at the sensor. A second gain (dual gain) kicks in at ISO 500, cutting input-referred read noise by about 1.1 stop. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 46,164 electrons; unity gain is around ISO 480.

FujiFilm X-T5 (ES)

The FujiFilm X-T5 (ES) was measured at 21 ISO settings from ISO 125 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (125) read noise is 2.73 DN. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

FujiFilm X-T4 vs FujiFilm X-T5 (ES) read noise table

ISOFujiFilm X-T4FujiFilm X-T5 (ES)
125–2.732
1601.8533.160
2002.1733.681
2502.6764.347
3203.3405.169
4004.0286.233
5002.4124.408
6402.8685.205
8003.7586.277
10004.4087.727
12505.4269.318
16006.72711.472
20008.22514.123
25009.98717.148
320012.72921.407
400015.34827.284
500018.76534.060
640022.78543.111
800028.84053.076
1000036.50467.649
1280046.52778.249

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Data: Photons to Photos · © William J. Claff