Changing Aperture/Iris

Changing Aperture/Iris on Fuji G Mount (GFX) Cameras

For GFX 50s and GFX 50R, press the button on the Smart Expander™ or Smart Adapter™ to toggle between P/S (Programmed Exposure/Shutter Priority) and A/M (Shutter Priority/Manual) exposure modes. The exposure mode chosen is displayed in the viewfinder and on the back LCD display. Use the dial on the camera to control aperture/iris in A or M exposure modes. If an optical image stabilization (OIS) lens is used, turn the IS/OS/VC switch to ON first before pushing the Smart Expander's or Smart Adapter's button. You may turn off optical image stabilization again after choosing the exposure mode.

For GFX 100 with up-to-date camera firmware and newer cameras, there is either a mode dial to select P, S, A, M exposure modes, or a button on the camera to bring up the P/S/A/M selection.

Changing Aperture/Iris on Fuji X Mount Cameras with Mode Dial

The X-A series, X-M series and X-T100 have a mode dial on the top plate of the camera. Set to A mode or M mode and use the command dial to manually set the aperture/iris. To have the camera choose the aperture/iris value automatically, set to S or P.

Changing Aperture/Iris on Fuji X Mount Cameras without Mode Dial

The X-Pro, X-T (except X-T100/X-T200) and X-E series do not have a mode dial on the top plate of the camera. Under the 'Wrench' tab, Button/Dial Setting, Aperture Setting, choose 'AUTO' to always have the camera choose the aperture/iris value automatically, 'MANUAL' to always choose your own aperture/iris value using the command dial, and 'AUTO+MANUAL' to use the command dial to change the aperture/iris manually until the dial is turned beyond the minimum aperture/iris and the camera will switch to automatically choose the aperture/iris value. The camera will display 'P' or 'S' instead of 'A' or 'M' when it is choosing the aperture/iris value automatically.

Using a Cinema Lens with Manual Iris

On a supported camera (X-T4 or X-H series) you may choose between T-stop display or F-stop display by pressing MENU => 'Wrench' tab => SCREEN SETTING => Page 2 => APERTURE UNIT FOR CINEMA LENS. Choose T NUMBER or F NUMBER.

Note: your cinema lens must have electronic contacts to transmit iris position. Ordinary lenses do not transmit T-stop data and they always show the F-stop.

Auto Iris

We recommend against uing auto iris/aperture during video capture. EF mount lenses adjust iris in 1/8th stop steps which may result in visible disruption in the footage or oscillation of the iris. Use A (Aperture Priority) or M (Manual) exposure modes.