600EX-RT and Hi Speed Sync with 5D MKIII.

[SteveW]

I'm reading conflicting comments on use of hi speed sync with the 600EX-RT and aperture priority.  Will the MKIII do so?  Or do I need to go to manual?  Also, will the ST-E3-RT transmitter allow hi speed sync with MKIII in aperture priority and the 600EX-RT on hi speed sync???  Shouldn't have to buy pocket wizards, etc with this nice equipment.  Any tips appreciated.

SW

[Mykolas]

Hi SteveW!

Thank you for posting about this.

High-Speed Sync is possible using any combination of the Speedlite 600EX-RT, Speedlite Transmitter ST-E3-RT and EOS 5D Mark III.  What you may be referring to as far as the AV mode is concerned is the [Flash sync speed in AV mode] setting in the [External Speedlite control] menu of the camera.  This has to be set to [Auto] to allow High-Speed Sync to be used.

[SteveW]

Mike,

Thanks a million for this "hot tip" or "nugget".  I must say I either missed it or didn't find it searching the web.  Just tried it and magically it works!  Not sure why this isn't mentioned in the myriad of tutorials on High Speed Sync. 

Thanks,

SW