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

Canon Speedlight 430EX III-RT flash: cannot get it to fire on optical slave mode - Please help

Casey415
Enthusiast

I have a new 430EX III-RT speedlight which works fine on my Canon EOS M50 camera when placed on the hotshoe.

 

But I cannot get the flash to fire on optical slave mode off camera. I have referred to Page 78 of the flash pdf manual over and over again, but the flash simply won't fire on optical slave mode. I have watched many YouTube videos about this and did many Google searches on this but cannot resolve this issue.

 

I have the pop-up flash enabled on my Canon M50 camera. When the pop-up flash fires, the 430EX III-RT flash does not fire even when set to optical slave mode.

 

What am I doing wrong? Or do I have a defective flash? Thanks!

1 REPLY 1

diverhank
Authority

As far as I know, the M50 cannot control as a master without a controller such as the ST-E2.  BTW, Optical slave mode symbol is the lightning bolt, not the "antenna" symbol which is for Radio mode.

================================================
Diverhank's photos on Flickr
Announcements
01/18/2023: New firmware version 1.1.1 is available for EOS R6 Mark II
01/09/2023: Help ensure your autofocus is properly aligned with a Canon Precision Alignment
01/03/2023: Welcome to CES 2023!
12/08/2022: New firmware version 1.0.5.1 is available for EOS C70
12/07/2022: New firmware version 1.7.0 is available for EOS R5
12/07/2022: New firmware version 1.7.0 is available for EOS R6
11/22/2022: New firmware available for EOS R3, EOS R7 and EOS R10
11/16/2022: We're thrilled to be ranked among the Best Employers for Veterans in 2022 by Forbes.
08/31/2022: New firmware version 1.1.1 is available for RF 70-200mm L IS USM
08/09/2022: New firmware version 1.2.0 is available for CR-N 300
08/09/2022: New firmware version 1.2.0 is available for CR-N 500
07/14/2022: New firmware version 1.0.1 is available for CR-X300
06/10/2022: Service Notice:UPDATE: Canon Inkjet Printer continuous reboot loop or powering down
06/07/2022: New firmware version 1.3.2 is available for PowerShot G7 X Mark III
05/31/2022: Did someone SAY Badges?
05/26/2022: New firmware version 1.0.5.1 is available for EOS-C500 Mark II
05/26/2022: New firmware version 1.0.3.1 is available for EOS-C300 Mark III
05/10/2022: Keep your Canon gear in optimal condition with a Canon Maintenance Service
05/05/2022: We are excited to announce that we have refreshed the ranking scale within the community!
04/26/2022: New firmware version 1.0.1.1 is available for EOS R5 C
03/23/2022: New firmware version 1.0.3.1 is available for EOS-C70
02/09/2022: Share Your Photos is back!
02/07/2022: New firmware version 1.6.1 is available for EOS-1DX Mark III
01/19/2022: READY FOR ANYTHING EOS-R5 C
01/13/2022: Community Update. We will be retiring the legacy profile avatars on 01/20/2022. Click this link to read more.