Godox TT685II-S TTL Camera Flash Instruction Manual

Foreword

Thank you for purchasing the Godox TT685II-S camera flash. This flash is compatible with Sony series cameras and supports TTL autoflash, simplifying shooting and ensuring correct flash exposure even in complex lighting conditions. Key features include: approximately GN60 (ISO 100, @200mm) with 81 power levels (1/1 to 1/256), full Sony TTL compatibility, wireless flash group functionality (transmitter or receiver), a dot-matrix LCD panel for clear operation, built-in 2.4GHz wireless transmission, and support for firmware upgrades.

Warning: Always keep the product dry. Do not disassemble. Keep out of reach of children. Avoid using in extreme temperatures or near flammable materials. Do not fire the flash directly into eyes. Turn off the unit immediately in case of malfunction.

Name of Parts

Body

01. Flash Head
02. Built-in Wide Panel
03. Wireless Sensor
04. Focus Assist Beam
05. Sync Cord Jack
06. Type-C USB Port
07. Battery Cover
08. Hotshoe
09. LCD Panel
10. Hotshoe Fixing Buckle
11. External Charging Port

Control Panel

11. <MENU> Flash Menu Button/Locking Button
12. <Z> Wireless Selection Button
13. Select Dial
14. Set Button
15. ON/OFF Power Switch
16. < > Test Button / Flash Ready Indicator
17. <ZOOM> Focus Length Setting
18. <MODE> Mode Selection Button
19. < > Lock Setting
20. <+/–> Power Output
21. Function Button 1
22. Function Button 2
23. Function Button 3
24. Function Button 4

LCD Panel

(1) TTL Autoflash

Zoom: zoom display. Displays focus length and distance indicator. Flash exposure compensation amount is also shown.

(2) M Manual Flash

Displays manual flash output.

(3) Multi Flash

Displays flash frequency and number of flashes.

(4) Radio Transmission Shooting (Transmitter Unit TX)

Displays flash mode, firing group, channel, and wireless settings.

Power Management

Use the ON/OFF Power Switch to power the flash unit on or off. Turn off if it will not be used for an extended period. As a transmitter, it automatically powers off after approximately 90 seconds of idle use. Pressing the camera shutter halfway or any flash button will wake it up. As a receiver, it enters sleep mode after a set period (default 60 minutes, adjustable to 30 minutes). Pressing any flash button will wake it up.

Tip: Disabling Auto Power Off function (C.Fn-STBY) is recommended when the flash is used off-camera.

Flash Mode - TTL Autoflash

In TTL mode, the camera and flash work together to calculate correct exposure. This mode supports FEC, FEL, HSS, and second-curtain sync. Pressing the <MODE> button cycles through flash modes.

ETTL Mode

Press <MODE> to enter E-TTL mode. The LCD will display settings. Half-press the shutter button to focus; aperture and effective flash range will be displayed. A pre-flash fires before the main flash for exposure calculation.

FEC: Flash Exposure Compensation

Adjust flash exposure compensation from -3 to +3 in 1/3 stops for fine-tuning TTL exposure. Use the <+/–> button and Select Dial to set the amount. Press Set Button to confirm.

High-Speed Sync

High-Speed Sync (FP flash) allows synchronization with all camera shutter speeds, useful for aperture priority fill-flash portraits. Press Function Button 2 <SYNC> to display <H>. Note that faster shutter speeds reduce effective flash range. Over-temperature protection may activate after 15 consecutive high-speed sync flashes.

Second-Curtain Sync

Use with slow shutter speeds to create light trails. Set the camera to REAR flash mode.

Flash Mode - M: Manual Flash

Adjust flash output from 1/1 to 1/256 in 1/10 stop increments. Use a handheld flash meter for accurate exposure. Press <MODE> to select <M>. Use the <+/–> button and Select Dial to set output. Press Set Button to confirm.

Optic S1/S2 Secondary Unit Setting: In M mode, press <S1/S2> button to use the flash as an optic S1 (synchronous with main flash) or S2 (ignores pre-flash) secondary flash.

Flash Mode - Multi: Stroboscopic Flash

Fire a rapid series of flashes to capture multiple images of a moving subject. Set firing frequency (Hz), number of flashes, and flash output. Press <MODE> to select <MULTI>. Use Function Button 2 <Times> and Function Button 3 <Hz> with the Select Dial to set flash times and frequency. Turn the Select Dial to set flash output. Press Set Button to confirm.

Calculating Shutter Speed: Shutter speed = Number of Flashes / Flash Frequency. Avoid overheating by not using stroboscopic flash more than 10 times in succession. Allow at least 15 minutes rest between uses.

Wireless Flash Shooting: Radio (2.4G) Transmission

The TT685II-S can act as a transmitter or receiver unit. It can also be controlled by the X1T-C transmitter (sold separately). This system allows advanced wireless multiple flash lighting similar to TTL autoflash shooting.

Wireless Settings

Switch between normal flash and wireless flash. Set to OFF for normal flash.

Setting the Communication Channel

Change channel IDs to prevent interference. Ensure transmitter and receiver units share the same channel ID. Press <MENU> to enter C.Fn CH settings. Use the Select Dial to choose a channel from 1 to 32. Press Set Button to confirm.

Wireless ID Settings

Change wireless ID and channels to avoid interference. Press <MENU> to enter C.Fn ID. Choose OFF to disable channel expansion or select a figure from 01 to 99.

Scan the Spare Channel

Use this function to find unused channels. Set SCAN to START. The device scans from 1% to 100%, displaying 8 spare channels.

5. TTL: Fully Automatic Wireless Flash Shooting

Attach the TT685IIS to the camera as a Transmitter unit. Set M/A/B/C groups to TTL. Set the controlled TT685IIS as the Receiver Unit. Ensure transmitter and receiver units are on the same channel. Position the camera and flashes. Check the flash ready indicator. Press the Transmitter unit's Test Button <> to fire the receiver unit. Adjust receiver position and distance if needed.

Note: Receiver auto power off can be managed via C.Fn settings. Auto AF-assist transmitter may not blink when the receiver's flash ready indicator is lit.

Using Fully Automatic Wireless Flash

FEC and other settings on the transmitter are automatically applied to the receiver. No receiver operation is needed. Follow normal flash shooting methods.

About the Transmitter Unit

Multiple transmitter units can be used with multiple cameras for synchronized shooting.

7. M: Wireless Flash Shooting with Manual Flash

This describes wireless multiple shooting using manual flash. Set all parameters on the transmitter unit. Select <M> mode. Set flash output for each receiver group (A/B/C) using the Function Buttons and Select Dial. Press Set Button to confirm.

Other Applications

Sync Triggering

Use the 2.5mm Sync Cord Jack to connect a trigger for synchronous firing with the camera shutter.

Auto Focus Assist Beam

The built-in AF assist beam activates in low-light conditions to aid autofocus. It turns off once focus is achieved. This feature can be disabled in C.Fn settings (AF set to OFF).

Bounce Flash

Point the flash head towards a wall or ceiling to soften shadows and create a more natural look. Rotate the flash head to adjust the bounce direction. Ensure the surface is plain and white for best results.

ZOOM: Setting the Flash Coverage

Flash coverage can be set automatically to match the lens focal length (20-200mm) or manually. In manual zoom mode, press <ZOOM> and use the Select Dial. If <A> is displayed, coverage is automatic.

Low Battery Warning

A blinking battery symbol on the LCD indicates low battery. Replace batteries immediately.

C.Fn: Setting Custom Functions

Customize flash functions via the C.Fn menu. Use the <MENU> button to access the menu. Select the Custom Function number using the Select Dial. Press Set Button to change the setting. Press <MENU> again to confirm. Long-press the "Clear" button for 2 seconds to reset all C.Fn settings to default.

Protection Function

1. Over-Temperature Protection

To prevent overheating, avoid firing more than 40 continuous flashes at 1/1 power. Allow at least 10 minutes of rest after 40 flashes. If the protection function activates, a symbol will appear on the LCD. Allow approximately 10 minutes for the unit to cool down.

High-Speed Sync Over-Temperature Protection

Tables indicate the number of flashes that activate over-temperature protection at various zoom and power levels during high-speed sync.

2. Other Protections

The system includes protection prompts (E1, E2, E3, E9) for issues like recycling system failure, overheating, high voltage, or firmware upgrade errors. Follow the on-screen prompts or consult a maintenance center.

Technical Data

Model: TT685II-S
Compatible Cameras: Sony single-lens reflex camera
Guide No. (1/1 output, 200mm): GN≈60 (m ISO100)
Flash Coverage: 20 to 200mm (Auto/Manual Zoom)
Flash Duration: 1/300s - 1/20000s
Exposure Control: TTL Autoflash, Manual Flash, Multi Flash
Flash Exposure Compensation (FEC): ±3 stops in 1/3 stop increments
Sync Mode: High-speed sync (up to 1/8000s), first-curtain sync, second-curtain sync
Wireless Flash (2.4G Radio Transmission): Transmitter, Receiver, Off
Transmitter Groups: M, A, B, C
Controllable Receiver Groups: A, B, C, D, E
Transmission Range (approx.): 100m
Channels: 32 (1-32)
ID: 01-99
Auto Focus Assist Beam: Yes
Effective Range (approx.): Center: 0.6-10m, Periphery: 0.6-5m
Power Supply: NI-MH battery (recommended) or LR6 alkaline battery x4
Recycle Time: 0.1-2.6s
Full Power Flashes: About 290 times (Ni-MH battery)
Power Saving: Auto power off after approx. 90 seconds (Transmitter) or 60 minutes (Receiver)
Sync Triggering Mode: Hotshoe, 2.5mm sync line
Working Temperature: -10°C - 50°C
Dimensions (WxHxD): 64*76*190 mm
Weight without battery: 405g
Weight with battery: 489g
2.4G Frequency Range: 2413.0MHz-2465.0MHz
Max. Transmitting Power: 5dbm

Troubleshooting

The Camera Flash does not fire.

Ensure the flash is securely attached to the camera.
Clean the electrical contacts of the flash and camera.

The power turns off by itself.

If set as Transmitter, auto power off activates after 90 seconds of idle use. Wake it up by pressing the shutter button halfway or any flash button.
If set as Receiver, it enters sleep mode after 60 minutes (or 30 minutes) of idle use. Wake it up by pressing any flash button.

Auto zoom does not work.

Ensure the flash is securely attached to the camera.

The flash exposure is underexposed or overexposed.

Check if high-speed sync is used (reduces effective range).
Ensure the subject is within the effective flash range.
If using Manual Flash mode, adjust output or switch to TTL.

Photos have dark corners or only parts of the subject are illuminated.

Check if the lens focal length exceeds the flash coverage. The TT685II-S has coverage from 20-200mm.

Firmware Upgrade

Use a Type-C USB cable for firmware upgrades. Download and install the Godox G3 firmware upgrade software. Select the appropriate firmware file.

Compatible Camera Models

This flash is compatible with Sony series cameras including A73, A9, A7R3, a77II, a99, RX10, a6000, and A7R. This list includes tested models; other Sony EOS cameras may be compatible.

Maintenance

Shut down the device immediately if abnormal operation is detected.
Avoid impacts and keep the product clean.
The flash tube may become warm during use; avoid continuous flashes unless necessary.
Maintenance should be performed by authorized service centers.
The product comes with a one-year warranty (excluding consumables like flash tubes). Unauthorized service voids the warranty.
Do not use the product if wet until professionally repaired.

FCC Statement

This device complies with Part 15 of the FCC Rules. Operation is subject to two conditions: no harmful interference, and acceptance of any received interference. Modifications not approved by the responsible party may void the user's authority to operate the equipment.

Declaration of Conformity

GODOX Photo Equipment Co., Ltd. declares that this equipment complies with essential EU requirements. For more information, visit the provided web link.

	Godox TT685II-C Thinklite TTL Camera Flash Instruction Manual This manual provides detailed instructions for the Godox TT685II-C Thinklite TTL Camera Flash, covering its features, operation, and maintenance. Learn about TTL automatic flash, manual flash, multi-flash, and wireless radio transmission.
	Godox TT685II-C TTL Camera Flash Instruction Manual Comprehensive instruction manual for the Godox TT685II-C TTL Camera Flash, covering features, operation, settings, troubleshooting, and maintenance for Canon EOS cameras.
	Godox TT685IIC Thinklite TTL Camera Flash Instruction Manual Comprehensive instruction manual for the Godox TT685IIC Thinklite TTL Camera Flash, covering its features, operation, modes, wireless shooting capabilities, custom functions, troubleshooting, and maintenance.
	Godox AD100Pro Pocket Flash Instruction Manual This manual provides detailed instructions for the Godox AD100Pro Pocket Flash, covering its features, operation, settings, and maintenance. Learn about TTL autoflash, manual flash, stroboscopic flash, wireless control, and more.
	Godox TT600 Thinklite Camera Flash Instruction Manual This manual provides detailed instructions for the Godox TT600 Thinklite Camera Flash, covering its features, operation, safety warnings, and maintenance. Learn how to attach, use, and customize settings for various photography scenarios.
	Godox AD300Pro Outdoor Flash Instruction Manual This manual provides detailed instructions for the Godox AD300Pro Outdoor Flash, covering its features, operation, maintenance, and technical specifications. Learn about TTL, manual, and stroboscopic flash modes, wireless control, and safety precautions.
	Godox AD400 Pro Witstro All-in-One Outdoor Flash: User Manual Comprehensive user manual for the Godox AD400 Pro Witstro All-in-One Outdoor Flash, covering features, operation, technical data, troubleshooting, and maintenance.
	Godox TT600 Thinklite Camera Flash User Manual Comprehensive user manual for the Godox TT600 Thinklite Camera Flash, covering features, operation, safety warnings, technical specifications, and maintenance. Learn how to use manual mode, stroboscopic flash, S1/S2 slave modes, Hi-Speed Sync, and custom functions for professional photography.