FujiFilm X100F - Manual (Page 66)

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Mode Selection
Shutter-Priority AE (S) Shutter-Priority AE (S)
To adjust shutter speed manually while letting the camera select aperture for optimal exposure, set
aperture to A and use the shutter speed dial. S will appear in the display.
1000 5.6 +1.0 800
Aperture: Select A (auto) Shutter speed: Choose a speed
R Shutter speed can also be adjusted in increments of 1 / 3 EV by rotating the rear command dial. Shutter speed
can be adjusted even while the shutter button is pressed halfway.
Q If the correct exposure can not be achieved at the selected shutter speed, aperture will be displayed in red
when the shutter button is pressed halfway. Adjust shutter speed until the correct exposure is achieved.
Q If the subject is outside the metering range of the camera, the aperture display will show “– – –”.