Sigma FP User Manual page 48

In CINE mode (CINE style)
To set the shutter angle (speed) and aperture, open the Quick Set menu

or select [
In the Quick Set menu, to switch to S Mode, press the

selecting the aperture. To switch to A mode, press the
selecting the shutter angle.
SHOOT] menu, to switch to S mode, set the aperture value to
In the [

[Auto]. To switch to A mode, set the shutter angle (speed) to [Auto].
TIP
WHEN YOU ARE USING AN L-MOUNT LENS WITH AN APERTURE
RING:
In Aperture Priority AE or Manual Exposure mode, you can set the aperture
value using the aperture ring of the lens. If you want to select an aperture
value using the camera menu or dial, set the aperture ring to position A.
ABOUT THE SHUTTER ANGLE (CINE/CINE STYLE)
For the cinema camera, the shutter angle (angle) is generally used as the
unit of exposure time in the shutter. For example, "360°" means that an
exposure time of 100% is applied for each frame, and "180°" means that an
exposure time of 50% is applied for each frame.
DIAL OPERATION IN CINE MODE (CINE STYLE)
In general use, an exposure operation carried out by dialing is prohibited in
CINE mode (CINE style), however, it can be permitted as needed.
SHOOT] → [Dial Exposure Operation] → [On]
[
48
SHOOT] → [Exposure Settings].
button while
button while