To Next PageTo Next Page
Need help?Do you have a question about the Godox TT685IIC and is the answer not in the manual?
Details the physical components of the flash unit.
Details the buttons and controls on the flash unit's interface.
Explains the E-TTL autoflash mode operation and LCD display.
Details the manual flash mode and its LCD display.
Explains the stroboscopic flash mode and its LCD display.
Covers radio transmission setup for transmitter and receiver units.
Explains how to adjust flash exposure compensation for correct exposure.
Describes the flash exposure bracketing function for capturing multiple exposures.
Explains how to use the flash as an optic S1 secondary unit for wireless triggering.
Details how to use the flash as an optic S2 secondary unit, ignoring pre-flashes.
Provides a formula to calculate appropriate shutter speeds for stroboscopic flash.
Guidance on positioning units and expected wireless transmission range.
Explains how to set up and manage multiple receiver units for advanced wireless shooting.
How to configure the transmitter unit for wireless operation.
How to configure receiver units for wireless operation.
Setting the manual flash mode for wireless operation.
How to use the sync cord jack for synchronized triggering.
Explains the function and usage of the auto focus assist beam.
Technique for bouncing flash off surfaces to soften light and shadows.
Lists flash functions controllable via the camera menu.
Details specific custom function settings available for the flash unit.
Details the flash's protection mechanism against overheating during use.
Solutions for when the camera flash fails to fire.
Addresses issues where the flash unit powers off unexpectedly.
Troubleshooting steps for when the auto zoom function is not operational.
Solutions for incorrect flash exposure results.
Solutions for issues with flash coverage causing dark areas.
The Godox Thinklite TTL Camera Flash TT685IIC is a versatile and powerful flash unit designed for Canon EOS series cameras, offering seamless compatibility with E-TTL II autoflash systems. This integration simplifies shooting, allowing users to achieve correct flash exposure even in complex lighting conditions. The flash unit boasts a range of advanced features, including a high guide number, extensive power output control, and robust wireless capabilities, making it suitable for both amateur and professional photographers.
The TT685IIC operates in three primary flash modes: E-TTL II Autoflash, Manual (M) Flash, and Multi (Stroboscopic) Flash. In E-TTL II mode, the camera and flash collaborate to calculate the optimal exposure for the subject and background. This mode supports several advanced TTL functions, including Flash Exposure Compensation (FEC), Flash Exposure Bracketing (FEB), Flash Exposure Lock (FEL), High-Speed Sync (HSS), and Second-Curtain Sync. FEC allows for fine-tuning flash output from -3 to +3 stops in 1/3rd increments, useful for environmental adjustments. FEB enables the capture of three consecutive shots with varying exposures (normal, over-exposed, and under-exposed), aiding in challenging lighting scenarios or with moving subjects. FEL locks the correct flash exposure for a specific part of the scene, ensuring consistent lighting. HSS (FP flash) allows the flash to synchronize with all camera shutter speeds, which is particularly useful for fill-flash portraits with wide apertures. Second-Curtain Sync creates a light trail effect by firing the flash just before the shutter closes, ideal for capturing moving subjects with a sense of motion.
Manual (M) Flash mode provides precise control over flash output, adjustable from 1/1 full power down to 1/256th power in 1/10th stop increments. This mode is ideal for photographers who prefer to manually determine flash output using a handheld flash meter. The TT685IIC also supports Optic S1 and S2 Secondary Unit settings in M mode. S1 mode allows the flash to fire synchronously with a main flash, mimicking radio triggers, while S2 mode is designed for cameras with pre-flash functions, ignoring the pre-flash and firing only with the actual flash.
Multi (Stroboscopic) Flash mode enables a rapid series of flashes to capture multiple images of a moving subject in a single photograph. Users can set the firing frequency (Hz), the number of flashes, and the flash output. This mode requires careful calculation of shutter speed to ensure the shutter remains open for the entire firing sequence.
A key feature of the TT685IIC is its built-in 2.4GHz wireless remote system, which allows it to function as both a Transmitter and Receiver unit within a wireless flash group. This radio transmission system simplifies advanced wireless multiple flash lighting, offering greater flexibility and range compared to optical systems. The flash can be divided into up to four firing groups (A, B, C, D, E), each with independent flash modes and ratios. This enables complex lighting setups, such as automatic wireless flash with multiple receiver units or manual wireless flash shooting with different outputs for each group. The wireless system also includes settings for communication channels and IDs to prevent interference from other wireless systems, along with a scan function to find spare channels.
Other applications include Sync Triggering via a 2.5mm jack for synchronous firing with the camera shutter, and a Focus Assist Beam that automatically lights up in low-light or low-contrast environments to aid autofocus. The flash head offers Bounce Flash capabilities, allowing users to direct the flash toward a wall or ceiling to soften shadows and create more natural-looking light. The flash coverage (ZOOM) can be set automatically to match the lens focal length or manually adjusted from 20mm to 200mm.
The TT685IIC features a dot-matrix LCD panel for clear and convenient operation, displaying current settings such as flash mode, zoom, exposure compensation, and wireless group status. The display is intuitive, showing only the settings currently applied, and the functions of the four function buttons adapt based on the selected mode. Buttons and dials are illuminated when operated, enhancing usability in various conditions.
Power management is efficient, with an ON/OFF power switch. When set as a transmitter, the flash automatically powers off after approximately 90 seconds of idle use, waking up with a half-press of the camera shutter or any flash button. As a receiver, it enters sleep mode after a user-adjustable period (default 60 minutes), waking up with any flash button press. Auto power-off can be disabled for off-camera use, and the receiver auto power-off timer can be set to 30 or 60 minutes.
The flash unit is designed for easy attachment to a camera via a hotshoe fixing buckle, which rotates to secure or detach the flash. Battery loading and unloading are straightforward, requiring four batteries to be inserted with correct polarity.
The TT685IIC also supports control through the camera's menu screen when attached to an EOS camera with a speedlite control function. This allows users to adjust flash functions, shutter sync, FEB, FEC, and flash firing settings directly from the camera. Custom Functions (C.Fn) provide further personalization, allowing users to configure settings like distance indicator units, AF-assist beam behavior, auto sleep settings, wireless ID, beeper sound, and backlighting time.
The TT685IIC incorporates several protection functions to ensure device longevity and user safety. Over-Temperature Protection prevents overheating and deterioration of the flash head by limiting continuous flashes at full power. If the flash fires more than 30 consecutive times at 1/1 power, a rest time of at least 10 minutes is recommended. If the protection function is activated, the recycling time may increase, and an icon will appear on the LCD display, indicating the need for a rest period.
The system provides real-time protection and prompts for various issues, such as recycling system failures (E1), excessive heat (E2), high flash tube voltage (E3), and firmware upgrade errors (E9). These prompts guide users to troubleshoot or seek authorized maintenance.
For general maintenance, it is advised to keep the product dry and avoid use in rain or damp conditions. The device should not be disassembled; any repairs should be performed by an authorized maintenance center. It should be kept out of reach of children and discontinued if damaged by extrusion, falling, or strong impact to prevent electric shock. The flash should not be fired directly into eyes, especially babies', to avoid visual impairment. It should not be used near flammable gases or chemicals, as strong light emission could cause fire or electromagnetic interference. Storage in ambient temperatures above 50°C should be avoided to prevent damage to electronic parts. In case of malfunction, the flash unit should be turned off immediately.
Regular dusting is recommended, and continuous flashes should be avoided if unnecessary, as the flash tube can become warm during use. The product is supported by a one-year warranty, excluding consumables like the flash tube. Unauthorized service will void the warranty, and any wetted or failed products should be repaired by professionals before further use. Firmware upgrades are facilitated via a Type-C USB port and require the Godox G3 software, ensuring the device stays up-to-date with the latest features and bug fixes.
General| Type | Speedlite |
|---|---|
| Zoom Range | 20-200mm |
| Color Temperature | 5600K ± 200K |
| Mount | Hot shoe |
| Compatibility | Canon |
| Guide Number | 60 m (ISO 100, 200mm) |
| Flash Modes | TTL, Manual, Multi |
| Recycle Time | 0.1 - 2.6 seconds |
| Power Source | 4 AA batteries |
| Flash Duration | 1/300s to 1/20000s |
| Vari-Power | 1/1 to 1/256 |
| Swivel Angle | 360 degrees |
| Wireless Functionality | Master and Slave modes (2.4GHz) |
