https://hk.canon/en/support/8203978100Ring-shaped flash, designed for EF Macro lenses1, with independently controlled left and right flash tubes
Maximum Guide Number is 14 (meter; ISO 100) for both sides firing or 10.5 (meter; ISO 100) for single-side firing
Supports E-TTL II / E-TTL / TTL autoflash and Manual Flash
Incorporates high-intensity white LED Focusing lamps with 5-step brightness adjustment
Silent recycling and shorter recycle time
Quick flash provided
Color temperature information transmission
Optical transmission wireless multiple flash shooting Master control supported
Inherits the advanced control interface of Speedlite 600EX-RT
Dot-Matrix LCD panel to display more flash settings information
New "Charge Indicator" on LCD panel for charging status
Speedlite control with EOS Digital Camera's menu
Compact flash control unit with improved connection cord arrangement
67mm filter thread provided at the front of flash unit for using optional protective filter or circular polarizing filter
Memory Function to save/load flash settings
12 Custom Functions and 4 Personal Functions
High Strength Metal mounting foot
Improved quick locking mechanism with "dust wipe mechanism" and "variable contact pressure" design
Implements 2-line transmission for important signals transmission
Overheat Protection provided to prevent the damage of flash due to overheating
Lens Cap E-67 II is included for attaching at the front of flash to better protect the lens
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