Canon has issued a product advisory for the Speedlite 600EX-RT and the ST-E3-RT Transmitter. Problems can arise with certain units when 7 or more units are linked together.
See the complete product advisory below, including instructions for identifying whether it affects your own equipment.
Firmware Notice: Speedlite 600EX-RT and Speedlite Transmitter ST-E3-RT
Firmware Notice
Thank you for using Canon products.
Phenomenon
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 Products
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] ~ [xx13xxxxxx]
- 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.
Support
To arrange to have an affected unit inspected and serviced for this phenomenon at no cost, please contact Canon using the information below.
This information is for residents of the United States and Puerto Rico only. If you do not reside in the USA or Puerto Rico, please contact the Canon Customer Support Center in your region.
Thank you for using Canon products.
Customer Support Operations
Canon U.S.A., Inc
Contact Information for Inquiries
Canon Customer Support Center
Phone: 1-800-OK-CANON
1-800-652-2666
TDD: 1-866-251-3752
Email: carecenter@cits.canon.com
For additional support options: usa.canon.com/support
I picked up a Yongnuo equivalent to this Speedlite, but I only have one, so nothing to test with.
Wonder if they’ll have the same problem? It’s more likely to get 7 Yongnuo ‘Speedlites’ rather than 7 Canon Speedlites, at $120 each compared to Canon’s $500+ each.
Ha. For sure.