cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Speedlite 600 EXII-RT RF signal dropping

jmaurophoto
Contributor

Greetings! I am a real estate photographer and I use as many as four EXII-RT speedlites for lighting spaces. One speedlite is on the camera and is the master in group A and is used to light the main room being photographed. The other speedlites are slaves and in groups B, C, and D as required for lighting adjacent rooms and spaces and are all RF controlled. For about the past year, the RF signal is constantly being dropped, requiring me to switch off and back on each speedlite to re-establish the connection. I waste more time resetting speedlites than I care to admit and it's really annoying. They might flash as expected, and then without reason, the signal is lost, requiring another reset. I have tried everything that I can think of. I have changed channels, scanned for the best channel, new batteries, and rotating master status to each speedlite. Nothing seems to work. They may work as expected for a while, and then it happens again.

At about $600 each when I purchased them, I didn't expect this failure. They all worked great when they were new, they worked great.

I expect that there are wedding and event photographers using multiple RF controlled speedlites in the same way.

I am wondering if anyone is experiencing similar challenges and if so, what solution(s) have you tried, and have any worked. I have asked Canon through CPS, but the only advice they could give was to change channels.

I prefer to use Canon, but at over $1,000 The EL-1 is out of the question, and the 600 series is no longer available. The 430EX won't work for me. The Godox TT685 is as powerful as the 600EXII-RT and at $130, it's a bargain. Plus it is built very well. I bought a Yongnuo as backup for when I send a flash in to CPS for service. It's functional, but a real P.O.S. The build quality really sucks. Good in an emergency or as a backup, but that's it.

Any feedback is highly appreciated! Thank you!

0 REPLIES 0
Holiday
Announcements
12/15/2025: New firmware update available for EOS C50 - Version 1.0.1.1

11/20/2025: New firmware updates are available.

EOS R6 Mark III - Version 1.0.1

EOS R3 - Version 2.0.0

EOS R1 - Version 1.2.0

EOS R5 Mark II - Version 1.2.0

EOS R5 - Version 2.2.1

PowerShot G7 X Mark III - Version 1.4.0

PowerShot SX740 HS - Version 1.0.2


10/21/2025: Service Notice: To Users of the Compact Digital Camera PowerShot V1

10/15/2025: New firmware updates are available.

Speedlite EL-5 - Version 1.2.0

Speedlite EL-1 - Version 1.1.0

Speedlite Transmitter ST-E10 - Version 1.2.0


07/28/2025: Notice of Free Repair Service for the Mirrorless Camera EOS R50 (Black)

07/24/2025: New firmware updates are available.


07/23/2025: New firmware updates are available.

EOS R5C - Version 1.1.1.1

EOS C80 - Version 1.0.3.1


7/17/2025: New firmware updates are available.

EOS R7 - Version 1.7.1

EOS R10 - Version 1.7.0

EOS R8 - Version 1.5.0

EOS R50 - Version 1.4.0

Powershot V10 - Version 1.4.0

Powershot V1 - Version 1.1.0

EOS R50V - Version 1.1.1


05/21/2025: New firmware update available for EOS C500 Mark II - Version 1.1.5.1

02/20/2025: New firmware updates are available.

RF70-200mm F2.8 L IS USM Z - Version 1.0.6

RF24-105mm F2.8 L IS USM Z - Version 1.0.9

RF100-300mm F2.8 L IS USM - Version 1.0.8

RF50mm F1.4 L VCM - Version 1.0.2

RF24mm F1.4 L VCM - Version 1.0.3


01/22/2024: Canon Supports Disaster Relief Efforts in California
01/14/2025: Steps to resolve still image problem when using certain SanDisk SD cards with the Canon EOS R5 Mark II