430ex speedlite with T3i camera - High speed sync question

[Zoky001]

I have a problem using the high speed sync feature on my 430ex that I use with my Canon T3i body. When the flash is mounted on the camera and the high speed sync feature is on, I can shoot as fast as I can without any problems. However, when I use the flash off camera (I use the promaster wireless hot shoe), even with the high speed feature on, I can only shoot up to 1/350 before I start to see the curtain creep up into the picture.

Why does this happen? Do I need to be using a different wireless hotshoe?

Thanks much!

[MikeSowsun]

In order for High Speed Sync to work off camera, the flash must have full ETTL communication with the camera.  One way is to use the Canon wireless Master/Slave system with a 580Ex II or ST-E2 "Master".  Another way is to use an Off Camaera Shoe Cord like the Canon OC-E3. 

There are also 3rd party wireless radio triggers that can provide ETTL and High speed sync.  

I am not familiar with the "Promaster Wireless Hot Shoe" but I suspect it does not give you the necessary ETTL communication.

[Zoky001]

Thank you Mike,

I guess I will have to find another device to trigger it!

[TCampbell]

The 430EX II can handle high-speed sync.  But the "problem" is that the on-board pop-up flash cannot handle high-speed sync.  This is why it works when the 430 is on the camera body, but does not work off-body.

It would work off-body as well... if only the on-camera trigger ALSO supported high-speed sync.