cancel
Showing results for 
Search instead for 
Did you mean: 

600ex-rt with ST-E3-RT.

Udi
Apprentice

Hello,
I have 2 600ex-rt with ST-E3-RT.When using the 2 flash, can I use the function Gr to control them separately ? ( one in ETTL and the second in Manuel mode )
Or I can only used them in Manuel mode ?
Thanks

2 REPLIES 2

TCampbell
Elite

To control them independently the Canon speedlite system has a concept called "groups".  All flashes in the same "group" will get the same settings... but if in different groups they can have different settings.

 

E.g. you can put one flash in "Group A" and the other in "Group B".

 

By default you might see the word "ALL" on your LCD which means the settings are being applied to ALL speedlites regardless of group.  But if you can switch groups and change the settings or you can use the "ratio" option.

 

If you use the "ratio" feature then you can, for example, set a 2:1 ratio which means one light should provide twice as much light as the other.

 

Or you can ignore the ratio and just go into the groups separately... e.g. set the flash exposure compensation on one group to fire at half-power and leave the other group alone -- which would be roughly the same thing as using the ratio feature.

 

What I would NOT do is attempt to have one flash in E-TTL and the other in Manual mode (I've never tried to do that and I"m not even sure it's possible.)  Normally ALL flashes should be in the same mode.  If anything is manual then they should all be manual.  If one is E-TTL then they should all be using E-TTL.

 

Tim Campbell
5D III, 5D IV, 60Da

Thanks Tim,
Your answer is very clear but the thing is that in one of Bruce Dorn YouTube tutorials about those speedlight he did set the flashes in differant mode.
When I tried it, it did give me this possibility but when i tried to take a pic the speedlighs radio transmitter change the setting.
So that's why I was confused.
Thanks.

Udi

 

Announcements
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
06/07/2022: New firmware version 1.0.3 is available for EOS M50 Mark II
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
03/22/2022: New firmware version 1.2.0 is available for PowerShot PICK
03/16/2022: New firmware version 1.5.2 is available for EOS-R5
03/16/2022: New firmware version 1.5.2 is available for EOS-R6
02/09/2022: Share Your Photos is back!
02/07/2022: New firmware version 1.1.1 is available for EOS-R3
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.
01/05/2022: Welcome to CES 2022!
12/7/2021: New firmware version 1.3.0 is available for Mount Adapter EF-EOS R 0.71x
12/7/2021: New firmware version 1.1.1 is available for CR-N 300
12/7/2021: New firmware version 1.1.1 is available for CR-N 500
12/2/2021: New firmware version 1.1.0 is available for RF 70-200 F4 L IS USM