Canon 5743B002 Instruction Manual page 4

Introduction
The Canon Speedlite Transmitter ST-E3-RT is a transmitter for wireless
flash shooting. It can control up to 5 groups (15 units) of Canon
Speedlites that have a wireless multiple flash shooting function using
radio transmission. The transmitter also has dust and water resistance
equivalent to EOS-1D series cameras.
Read this instruction manual while also referring to the
instruction manuals of your camera and Speedlite.
Before using the transmitter, read this instruction manual and the
instruction manuals of your camera and Speedlite to familiarize
yourself with the operations.
Using the transmitter with a Camera
Using with an EOS digital camera (Type-A camera)
• You can perform wireless autoflash shooting with easy operations.
Using with an EOS film camera
• When using with an EOS film camera compatible with E-TTL II
and E-TTL autoflash systems (Type-A camera), you can perform
autoflash shooting with easy operations.
• This unit cannot be used with an EOS film camera with TTL
autoflash system (Type-B camera).
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