BlueSky, to clarify what I am talking about. If you set the _camera_ to M mode, or any other mode that would allow you to set shutter time long enough to observe first and second curtain sync, and leave _flash_ on E-TTL, flash will fire a preflash and a second curtain sync burst.
If I set the _flash_ to M mode, only the second curtain sync burst will be visible, because no TTL / E-TTL flash operation will take place. That is what Sriram confirmed and what my tests showed. I think this is the same what you say. > -----Original Message----- > > Hi Miha, > Sriram got all the questions covered, just want to clarify a small > detail. > > Miha wrote: > > Second curtain sync. We know that with E-ttl, the flash "should" fire > preflash to calculate the correct flash exposure. > > If I set the camera to mode Av, and set such apperture value that the > shutter speed will be long enough for me to see whether the flash fires at > the second curtain, the flash fires two times (first curtain or > preflash and > second curtain) when set to E-TTL and only on second curtain when > set to M. > > IIRC, even with the camera in M mode, the pre-flash should fire > at the first > curtain and then the actual flash will fire at the second > curtain, just like > in Av mode. Maybe your shutter speed setting in M mode is too fast to > observe the two flashes, or you're talking about the flash being set to M > mode? > > I'm using EOS30 with 420EX, if it matters. > > BlueSky > * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
