Phenomenon in Canon Speedlite 600EX-RT and Speedlite Transmitter ST-E3-RT

10th December 2015
Notice to Fix Phenomenon in Linked Shooting and Wireless Flash Shooting (During use with 7 or more units).

Thank you for using Canon products.


Except as described below, the following will occur with the affected units listed below:

Linked shooting and wireless flash shooting with radio transmission will not work in some setting modes when 7 or more units are linked. This phenomenon does not occur when 6 or fewer units are linked.

Affected Product

Speedlite 600EX-RT and Speedlite Transmitter ST-E3-RT

Units with a combination of 3rd and 4th digits in the serial number in the ranges shown below are affected.

Speedlite 600EX-RT: [xx01xxxxxx] ~ [xx12xxxxxx]
Speedlite Transmitter ST-E3-RT: [xx01xxxxxx] ~ [xx03xxxxxx]
Note: If the battery compartment of an affected unit contains the marking illustrated below, the product is NOT affected by the phenomenon described above, even if the serial number is within the ranges mentioned above.

Speedlite 600EX-RT Speedlite Transmitter ST-E3-RT

Market Support

To arrange to have the affected units inspected and serviced for this phenomenon at no cost, please contact our Canon Service Centres.

Contact Information for Inquiries

Australia: Call 13 13 83 (select option 2, then option 2)

New Zealand: Call 0800 222 666 (select option 3, then option 1)
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