Flash units can be mounted on the hot shoe or connected via the sync terminal.
Optional external flash units are more powerful than the EF-X8 supplied with the camera. Some support high-speed sync (FP) and can be used at shutter speeds faster than the sync speed, while others can function as master flash units controlling remote units via optical wireless flash control.
You may be unable to test-fire the flash in some circumstances, for example when a setup menu is displayed on the camera.
To adjust settings for a flash unit mounted on the hot shoe or connected via the sync terminal:
Connect the unit to the camera.
In shooting mode, select FLASH FUNCTION SETTING in the 
(FLASH SETTING) menu tab. The options available vary with the flash unit.
| Menu | Description |
|---|---|
| SUPPLIED FLASH |
Displayed when the supplied EF‑X8 flash unit is mounted on the hot shoe and raised. |
| SYNC TERMINAL |
SYNC TERMINAL is displayed if the EF‑X8 is lowered and either no flash unit, or an incompatible flash unit, is mounted on the hot shoe. |
| SHOE MOUNT FLASH |
Displayed when an optional flash unit is mounted on the hot shoe and turned on. |
| MASTER (OPTICAL) |
Displayed if an optional flash unit functioning as a master flash for FUJIFILM optical wireless remote flash control is connected and turned on. |
Third-party studio flash commanders compatible with the FUJIFILM flash system can now be used. For more information, see the documentation provided your studio flash unit.
Highlight items using the focus stick (focus lever) and rotate the rear command dial to change the highlighted setting.
Press DISP/BACK to put the changes into effect.
Red-Eye Removal
Red-eye removal is available when an option other than OFF is selected for FLASH SETTING > RED EYE REMOVAL and a “FACE ON” option is selected for 
AF/MF SETTING > FACE/EYE DETECTION SETTING. Red-eye removal minimizes “red-eye” caused when light from the flash is reflected from the subject’s retinas.
SYNC TERMINAL is displayed if the EF-X8 is lowered and either no flash unit, or an incompatible flash unit, is mounted on the hot shoe.
| Setting | Description |
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Choose from the following options: M: A trigger signal is transmitted via the hot shoe X contacts when a picture is taken. Choose a shutter speed slower than the sync speed; even slower speeds may be required if the unit uses long flashes or has a slow response time.
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Choose whether the flash is timed to fire immediately after the shutter opens ( /1ST CURTAIN) or immediately before it closes ( /2ND CURTAIN). 1ST CURTAIN is recommended in most circumstances. |
The following options are available with optional shoe-mounted flash units.
| Setting | Description |
|---|---|
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The flash control mode selected with the flash unit. This can in some cases be adjusted from the camera; the options available vary with the flash. TTL: TTL mode. Adjust flash compensation ( M: The flash fires at the selected output regardless of subject brightness or camera settings. Output in some cases can be adjusted from the camera ( MULTI: Repeating flash. Compatible shoe-mounted flash units will fire multiple times with each shot.
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The options available vary with flash control mode. TTL: Adjust flash compensation (the full value may not be applied if the limits of the flash control system are exceeded). In the cases of the EF‑X20, EF‑20, EF‑42, and EF‑X500, the selected value is added to the value selected with the flash unit. M/MULTI: Adjust flash output (compatible units only). Choose from values expressed as fractions of full power, from 1/1 (mode M) or 1/4 (MULTI) down to 1/512 in increments equivalent to 1/3 EV. The desired results may not be achieved at low values if they exceed the limits of the flash control system; take a test shot and check the results. |
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Choose a flash mode for TTL flash control. The options available vary with the shooting mode (P, S, A, or M) selected.
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Control flash timing.
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The angle of illumination (flash coverage) for units that support flash zoom. Some units allow the adjustment to be made from the camera. If AUTO is selected, zoom will automatically be adjusted to match coverage to lens focal length. |
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If the unit supports this feature, choose from:
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Choose how the built-in LED light functions during still photography (compatible units only): as a catchlight ( /CATCHLIGHT), as an AF-assist illuminator ( /AF ASSIST), or as both a catchlight and an AF-ASSIST illuminator ( /AF ASSIST+CATCHLIGHT). Choose OFF to disable the LED during photography. |
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Choose the number of times the flash fires each time the shutter is released in MULTI mode. |
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Choose the frequency at which the flash fires in MULTI mode. |
* Full value may not be applied if limits of flash control system are exceeded.
The options at right will be displayed if the unit is currently functioning as master flash for FUJIFILM optical wireless remote flash control.
The master and remote units can be placed in up to three groups (A, B, and C) and flash mode and flash level adjusted separately for each group. Four channels are available for communication between the units; separate channels can be used for different flash systems or to prevent interference when multiple systems are operating in close proximity.
| Setting | Description |
|---|---|
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Choose flash control modes for groups A, B, and C. TTL% is available for groups A and B only. TTL: The units in the group fire in TTL mode. Flash compensation can be adjusted separately for each group. TTL%: If TTL% is selected for either group A or B, you can specify the output of the selected group as a percentage of the other and adjust overall flash compensation for both groups. M: In mode M, the units in the group fire at the selected output (expressed as a fraction of full power) regardless of subject brightness or camera settings. MULTI: Choosing MULTI for any group sets all the units in all groups to repeating flash mode. All units will fire multiple times with each shot.
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Adjust flash level for the selected group according to option selected for flash control mode. Note that the full value may not be applied if the limits of the flash control system are exceeded. TTL: Adjust flash compensation. M/MULTI: Adjust flash output. TTL%: Choose the balance between groups A and B and adjust overall flash compensation. |
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Choose a flash mode for TTL flash control. The options available vary with the shooting mode (P, S, A, or M) selected.
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Control flash timing.
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The angle of illumination (flash coverage) for units that support flash zoom. Some units allow the adjustment to be made from the camera. If AUTO is selected, zoom will automatically be adjusted to match coverage to lens focal length. |
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If the unit supports this feature, choose from:
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Assign the master flash to group A (Gr A), B (Gr B), or C (Gr C). If OFF is selected, output from the master flash will be held to a level that does not affect the final picture. Available only if the unit is mounted on the camera hot shoe as a master flash for FUJIFILM optical wireless remote flash control in TTL, TTL%, or M mode. |
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Choose the number of times the flash fires each time the shutter is released in MULTI mode. |
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Choose the channel used by the master flash for communication with the remote flash units. Separate channels can be used for different flash systems or to prevent interference when multiple systems are operating in close proximity. |
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Choose the frequency at which the flash fires in MULTI mode. |
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Flash control mode
: The trigger signal is disabled.
Sync
Flash mode (TTL)
(FLASH AUTO): The flash fires only as required; flash level is adjusted according to subject brightness. A 
icon displayed when the shutter button is pressed halfway indicates that the flash will fire when the photo is taken.
(STANDARD): The flash fires with every shot if possible; flash level is adjusted according to subject brightness. The flash will not fire if not fully charged when the shutter is released.
(SLOW SYNC.): Combine the flash with slow shutter speeds when photographing portrait subjects against a backdrop of night scenery. The flash will not fire if not fully charged when the shutter is released.
Sync
(AUTO FP(HSS)): High-speed sync (compatible units only). The camera automatically engages front-curtain high-speed sync at shutter speeds faster than the flash sync speed. Equivalent to 1ST CURTAIN when MULTI is selected for flash control mode.
Zoom
Lighting
(FLASH POWER PRIORITY): Gain range by slightly reducing coverage.
(STANDARD): Match coverage to picture angle.
(EVEN COVERAGE PRIORITY): Slightly increase coverage for more even lighting.
LED light
Frequency *
Zoom
Lighting
Master
Channel
