To Users of Canon Speedlite 600EX-RT and Speedlite Transmitter ST-E3-RT
Notice Regarding Firmware to Fix Phenomenon in Linked Shooting and Wireless Flash Shooting (During Use with 7 or More Units) When Using the Canon Speedlite 600EX-RT and Speedlite Transmitter ST-E3-RT
Affected serial numbers of Speedlite 600EX-RT.
Thank you for using Canon products.
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.
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.
The products with this phenomenon will be inspected and serviced free-of-charge. If you own one of the affected products, please contact our customer service hotline. Our free repair service will start on 18 December 2015. We offer our sincerest apologies to the customers using these products who have been inconvenienced by this issue.
Contact Information for Inquiries
For questions about this matter, please contact our Customer Service Hotline.