Quote Originally Posted by peety3
I'm sorry, but this quote does not explain why the ST-E2 can use HSS and the in-camera flash can't. HSS isn't dependent on wavelength.

You're right. It doesn't explain it and my choice of words was incorrect. But I still think this got something to do with the fact that the ST-E2 can handle HSS and the on-board flash can't. I'll rephrase my lines.


Anyway thanks for informing me.